QUIZ: How Well Do You Remember “The Big Bang Theory?”

“The Big Bang Theory” ran for 12 seasons from 2007 to 2019, and in that time, audiences fell in love with Leonard and his intellectual pals, Sheldon, Howard and Raj. And over the course of the series, various unforgettable things happened that have made us laugh like Sheldon’s habit of knocking on someone’s door three times or Raj’s initial inability to speak with women.

And with every new season of the popular series came new characters, cameos and unforgettable moments for the group. But here’s a quiz that will likely leave even the most hardcore fan of “The Big Bang Theory” stumped. Do you remember these moments from the longest-running multi-camera comedy ever aired on TV?

“The Big Bang Theory” ran for 12 seasons from 2007 to 2019, and in that time, audiences fell in love with Leonard and his intellectual pals, Sheldon, Howard and Raj. And over the course of the series, various unforgettable things happened that have made us laugh like Sheldon’s habit of knocking on someone’s door three times or Raj’s initial inability to speak with women.

And with every new season of the popular series came new characters, cameos and unforgettable moments for the group. But here’s a quiz that will likely leave even the most hardcore fan of “The Big Bang Theory” stumped. Do you remember these moments from the longest-running multi-camera comedy ever aired on TV?

Sheldon’s mother calls him by a nickname. What nickname does she have for her brilliant son?

  • Pumpkin
  • Shelly
  • Coopie

Much to Sheldon’s horror, his mother and sister often refer to him as Shelly, a nickname that was first mentioned on the episode “The Luminous Fish Effect" in season one.

Much to Sheldon’s horror, his mother and sister often refer to him as Shelly, a nickname that was first mentioned on the episode “The Luminous Fish Effect" in season one.

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What issue did Penny run into when she tried to unlock Leonard's iPad?

  • She couldn't remember his birthday which was his password
  • She dropped the iPad and broke it
  • She dropped the iPad in water

Leonard wasn’t too upset. But what viewers found odd about the situation was that Penny had thrown Leonard a birthday party in season one and the episode in question happened about six years later. So it didn’t make sense that she had forgotten his birthday.

Leonard wasn’t too upset. But what viewers found odd about the situation was that Penny had thrown Leonard a birthday party in season one and the episode in question happened about six years later. So it didn’t make sense that she had forgotten his birthday.

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Which actress played Leonard’s mom?

  • Christine Baranski
  • Teri Hatcher
  • Estelle Parsons

Known best for her role in “The Good Wife,” Baranski first appeared as Leonard’s mom in season 2, episode 15 and continued to recur as the high-strung character until the end of the series.

Known best for her role in “The Good Wife,” Baranski first appeared as Leonard’s mom in season 2, episode 15 and continued to recur as the high-strung character until the end of the series.

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Why did creator Chuck Lorry almost turn down Jim Parsons for the role of Sheldon Cooper?

  • They wanted someone else
  • He was too good to be true
  • He was too old

Chuck Lorre initially didn’t want to cast Jim Parsons for the role because he thought he was too good at his audition. After Parsons finished his audition, Bill Prady, who co-created the show with Lorre, turned around and told Lorre “That's the guy!” to which Lorre said, “Nah, he's gonna break your heart. He'll never give you that performance again.” Boy where they wrong, huh?

Chuck Lorre initially didn’t want to cast Jim Parsons for the role because he thought he was too good at his audition. After Parsons finished his audition, Bill Prady, who co-created the show with Lorre, turned around and told Lorre “That's the guy!” to which Lorre said, “Nah, he's gonna break your heart. He'll never give you that performance again.” Boy where they wrong, huh?

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Which of these actors was approached to play a role on "The Big Bang Theory?"

  • Macaulay Culkin
  • Britney Spears
  • Kim Kardashian

The “Home Alone” star admitted he was approached three times to play a role on the show, (but he never specified who he would’ve played). Apparently, the plot didn’t resonate with Culkin, who told the producers to take a hike. He said, “I said no. It was kind of like, the way the pitch was, ‘Alright, these two astrophysicist nerds and a pretty girl lives with them. Yoinks!’ That was the pitch. And I was like, ‘Yeah, I’m cool, thanks.’”

The “Home Alone” star admitted he was approached three times to play a role on the show, (but he never specified who he would’ve played). Apparently, the plot didn’t resonate with Culkin, who told the producers to take a hike. He said, “I said no. It was kind of like, the way the pitch was, ‘Alright, these two astrophysicist nerds and a pretty girl lives with them. Yoinks!’ That was the pitch. And I was like, ‘Yeah, I’m cool, thanks.’”

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What was the name of the character Kaley Cuoco originally auditioned for?

  • Penny
  • Katie
  • Amy Farrah Fowler

Believe it or not, the original title of the show was supposed to be "Lenny, Penny, and Kenny." Yikes! We know! During an interview with TV Insider, Cuoco confessed she had originally auditioned for the role of Katie which was part of the unaired pilot, but she wasn’t cast because she was too young at the time.

Believe it or not, the original title of the show was supposed to be "Lenny, Penny, and Kenny." Yikes! We know! During an interview with TV Insider, Cuoco confessed she had originally auditioned for the role of Katie which was part of the unaired pilot, but she wasn’t cast because she was too young at the time.

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What was Penny’s maiden name?

  • Teller
  • Hofstadter
  • Cuoco

The creators decided to keep Penny’s last name a total mystery throughout the series. But unbeknownst to fans, Penny’s last name was revealed in season two. When she married Leonard, she became Penny Hofstadter, but her maiden name was Teller. This is revealed in season 2, episode 18, when Sheldon delivers a box of supplies where you can clearly see her full name.

The creators decided to keep Penny’s last name a total mystery throughout the series. But unbeknownst to fans, Penny’s last name was revealed in season two. When she married Leonard, she became Penny Hofstadter, but her maiden name was Teller. This is revealed in season 2, episode 18, when Sheldon delivers a box of supplies where you can clearly see her full name.

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What mental disorder or condition does Sheldon Cooper have?

  • Asperger's syndrome
  • Autistic
  • None

The writers didn’t actually base the character on a condition or syndrome. Due to his anti-social manners and “Sheldony” ways, most viewers assumed Sheldon Cooper had Asperger's syndrome. But the creators have a different take on that, saying, "We write the character as the character. A lot of people see various things in him and make the connections. Our feeling is that Sheldon's mother never got a diagnosis, so we don't have one.”

The writers didn’t actually base the character on a condition or syndrome. Due to his anti-social manners and “Sheldony” ways, most viewers assumed Sheldon Cooper had Asperger's syndrome. But the creators have a different take on that, saying, "We write the character as the character. A lot of people see various things in him and make the connections. Our feeling is that Sheldon's mother never got a diagnosis, so we don't have one.”

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What other talents does the Big Bang Theory cast have?

  • They’re amazing singers
  • Most of the cast plays basketball
  • They’re all great musicians

Aside from having flawless comedic timing, most of the cast members are highly skilled musicians. Jim Parsons and Mayim Bialik took the time to learn how to play the harp and the theremin for the show, while Johnny Galecki has played the cello from a very young age.

Aside from having flawless comedic timing, most of the cast members are highly skilled musicians. Jim Parsons and Mayim Bialik took the time to learn how to play the harp and the theremin for the show, while Johnny Galecki has played the cello from a very young age.

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Is Soft Kitty a real song or a made-up lullaby to comfort Sheldon?

  • Penny used to sing this song to help Sheldon fall asleep
  • Sheldon made up the song
  • It’s an old song

Soft Kitty is a song that dates back all the way to the 1930s. Well, sort of! According to a copyright lawsuit, the children’s song “Warm Kitty” which was written by Edith Newlin, appeared in the book "Songs for the Nursery School" which was published in 1937.

Soft Kitty is a song that dates back all the way to the 1930s. Well, sort of! According to a copyright lawsuit, the children’s song “Warm Kitty” which was written by Edith Newlin, appeared in the book "Songs for the Nursery School" which was published in 1937.

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Who was Raj’s girlfriend, who was played by Kate Miccuci, supposed to play originally?

  • Penny
  • Bernadette
  • Amy

We can’t imagine anyone other than Mayim Bialik as Amy, but actress Kate Miccuci, who plays Raj’s shy girlfriend had originally auditioned to play Sheldon’s girlfriend. The awkwardness was there, but the role didn’t quite suit her. Eventually, she landed the role of Lucy.

We can’t imagine anyone other than Mayim Bialik as Amy, but actress Kate Miccuci, who plays Raj’s shy girlfriend had originally auditioned to play Sheldon’s girlfriend. The awkwardness was there, but the role didn’t quite suit her. Eventually, she landed the role of Lucy.

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Can you name Sheldon’s catchphrase?

  • I’m not crazy, my mother had me tested.
  • Bazinga!
  • Don’t you think if I were wrong, I’d know it?

For 12 seasons, Sheldon used this catchphrase whenever he wanted people to know he was pranking someone.

For 12 seasons, Sheldon used this catchphrase whenever he wanted people to know he was pranking someone.

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On average, how much did Jim Parsons, Kaley Cuoco and Johnny Galecki make per episode?

  • $300,000
  • $700,000
  • $1 million

The trio had reportedly been making around $300,000 per episode, but after striking a deal with CBS, the actors got a lucrative bump in their salaries and they reportedly made about $1 million per episode.

The trio had reportedly been making around $300,000 per episode, but after striking a deal with CBS, the actors got a lucrative bump in their salaries and they reportedly made about $1 million per episode.

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There was no shortage of celebrity cameos on the show. Can you name four of them?

  • Stan Lee, Bill Nye, James Earl Jones, and Carrie Fisher
  • Elon Musk, Joey Lawrence, William Shatner, and Al Gore
  • Albert Einstein, Jenna von Oy, Leonard Nimoy, and Sara Gilbert

As you can imagine, the show about a group of brainy science nerds attracted a plethora of big name celebs and some of the greatest minds of the 21st century, including Bill Nye the science guy, Microsoft’s creator Bill Gates, CEO of Tesla Motors Elon Musk, and astronaut Buzz Aldrin.

As you can imagine, the show about a group of brainy science nerds attracted a plethora of big name celebs and some of the greatest minds of the 21st century, including Bill Nye the science guy, Microsoft’s creator Bill Gates, CEO of Tesla Motors Elon Musk, and astronaut Buzz Aldrin.

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Which cast members actually dated each other in real life?

  • Melissa Rauch and Simon Helberg
  • Kaley Cuoco and Johnny Galecki
  • Kevin Sussman and Mayim Bialik

Despite the many fictional entanglements and on-screen romances, the only actors who actually dated their co-stars were Kaley Cuoco and Johnny Galecki, who dated for two years.

Despite the many fictional entanglements and on-screen romances, the only actors who actually dated their co-stars were Kaley Cuoco and Johnny Galecki, who dated for two years.

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What was Sheldon and Amy’s Youtube podcast called? This is a tricky one.

  • Dr. Sheldon Cooper's Fun With Flags
  • Sheldon Cooper and Amy Farrah Fowler’s Fun With Flags
  • Fun With Flags with Sheldon Cooper and Amy Farrah Fowler

Sheldon dedicated an entire video podcast to teach people how to properly fold flags and handle them.

Sheldon dedicated an entire video podcast to teach people how to properly fold flags and handle them.

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How many pilots did the producers have to make before CBS picked up the series?

  • One, it was love at first sight for CBS
  • Two
  • Three

The show filmed 2 different pilots because the first one was sort of a flop. Still, CBS thought it had potential, so Lorre and Prady gave it one more shot and it was a big bang, indeed.

The show filmed 2 different pilots because the first one was sort of a flop. Still, CBS thought it had potential, so Lorre and Prady gave it one more shot and it was a big bang, indeed.

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Which "Star Trek" actor was Sheldon Cooper’s sworn enemy on the show?

  • Wil Wheaton
  • William Shatner
  • Patrick Stewart

Some believe the feud started when Wheaton failed to attend the 1995 Dixie Star Trek convention, which left Sheldon angry after he rode the bus for 10 hours to meet him. Throughout the show, Wheaton was always one upping Sheldon, which explains why there was so much animosity.

Some believe the feud started when Wheaton failed to attend the 1995 Dixie Star Trek convention, which left Sheldon angry after he rode the bus for 10 hours to meet him. Throughout the show, Wheaton was always one upping Sheldon, which explains why there was so much animosity.

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How did Amy Farrah Fowler’s character came to be a neurosurgeon?

  • They needed her character to be smart enough for Sheldon to take a liking to her
  • They needed her to be nerdy
  • Mayim Bialik has a PhD in neuroscience, so they decided Amy’s profession should be the same

Producers of the show didn’t have a profession set in mind for Mayim Bialik's character, but when she joined the cast, they decided it would be a smart move to make her career be the same as the actress who played her.

Producers of the show didn’t have a profession set in mind for Mayim Bialik's character, but when she joined the cast, they decided it would be a smart move to make her career be the same as the actress who played her.

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Which city is “The Big Bang Theory” set in?

  • Silicon Valley, California
  • Pasadena, California
  • Los Angeles, California

Both Sheldon and Leonard work at Caltech and live together in Pasadena, across the hall from Penny. Their apartment is located in the fictional address 2311 North Los Robles Avenue.

Both Sheldon and Leonard work at Caltech and live together in Pasadena, across the hall from Penny. Their apartment is located in the fictional address 2311 North Los Robles Avenue.

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What is the name of the restaurant where Penny works as a waitress in the pilot?

  • Cheesecake Factory
  • Olive Garden
  • Chipotle

In the pilot, Penny works at Cheesecake Factory as a waitress to support herself while she waits for her big break as an aspiring actress.

In the pilot, Penny works at Cheesecake Factory as a waitress to support herself while she waits for her big break as an aspiring actress.

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There’s an ongoing fan theory about Sheldon’s t-shirts and what they represent. What is this theory about?

  • His t-shirts change colors depending on his emotions
  • He has OCD
  • Each day of the week represents a different color

According to fans, when Sheldon’s angry, he wears a red t-shirt. When he’s calm and feeling fine, he wears green, and when he wears light blue, it’s because he’s feeling hopeful.

According to fans, when Sheldon’s angry, he wears a red t-shirt. When he’s calm and feeling fine, he wears green, and when he wears light blue, it’s because he’s feeling hopeful.

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What is the name of the Big Bang Theory’s theme song?

  • “It All Started with a Big Bang”
  • “The History of Everything”
  • “The Big Bang Song”

The song is composed and performed by the iconic band "Barenaked Ladies." Unfortunately, the song resulted in a lawsuit due to its use on the show, because one of the band's members believed that they weren't properly paid for its use.

The song is composed and performed by the iconic band "Barenaked Ladies." Unfortunately, the song resulted in a lawsuit due to its use on the show, because one of the band's members believed that they weren't properly paid for its use.

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Who was initially meant to play Sheldon Cooper? Hint: He’s part of the cast.

  • Johnny Galecki
  • Simon Helberg
  • Kevin Sussman

A long time ago, way before the show was picked up, co-creators Chuck Lorre and Bill Prady originally wanted Galecki to play Sheldon. The actor told Larry King, “they came to me with the idea of playing Jim Parsons' character, the Sheldon character. This is long before they had met Jim and before anything was even written.”

A long time ago, way before the show was picked up, co-creators Chuck Lorre and Bill Prady originally wanted Galecki to play Sheldon. The actor told Larry King, “they came to me with the idea of playing Jim Parsons' character, the Sheldon character. This is long before they had met Jim and before anything was even written.”

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Who created Sheldon Cooper’s character as we know it?

  • Chuck Lorre and Bill Prady
  • Bill Prady
  • Jim Parsons

Sheldon Cooper wouldn’t be the Sheldon Cooper we know and love without Jim Parson’s brilliant take on the character. After his audition, Chuck Lorre said, “He was astonishing, I didn't even believe it when it happened. I never anticipated the character being the way he crafted it. It was funny, it was touching, it was real.”

Sheldon Cooper wouldn’t be the Sheldon Cooper we know and love without Jim Parson’s brilliant take on the character. After his audition, Chuck Lorre said, “He was astonishing, I didn't even believe it when it happened. I never anticipated the character being the way he crafted it. It was funny, it was touching, it was real.”

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What is the name of "The Big Bang Theory’s" spin-off series?

  • The Big Theory
  • Sheldon’s Past
  • Young Sheldon

The successful spin-off follows the life of a young Sheldon Cooper. The show focuses on his childhood and how Sheldon struggles to balance being a bona fide genius while trying to fit in with other kids.

The successful spin-off follows the life of a young Sheldon Cooper. The show focuses on his childhood and how Sheldon struggles to balance being a bona fide genius while trying to fit in with other kids.

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Why do Howard and Bernadette’s house and Raj’s apartment never appear in the same episode?

  • They’re the same set
  • Raj never lived in an apartment
  • Howard and Bernadette live too far away

Yup! Raj’s apartment and Howard and Bernadette’s home are located in the same set, therefore, it would be a major hassle having to redecorate and switch up the furniture for just one episode.

Yup! Raj’s apartment and Howard and Bernadette’s home are located in the same set, therefore, it would be a major hassle having to redecorate and switch up the furniture for just one episode.

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How many times did Penny and Leonard break up on the show?

  • 3
  • 2
  • 1

Despite the fact that Penny and Leonard had a few bumps on the road of their relationship, viewers only saw them break up once. They got back together after Leonard called things off with Priya.

Despite the fact that Penny and Leonard had a few bumps on the road of their relationship, viewers only saw them break up once. They got back together after Leonard called things off with Priya.

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Why was Kaley Cuoco MIA during two season four episodes?

  • She was on maternity leave
  • She was suspended from work
  • She broke her leg

During the accident, a horse tried to jump over Cuoco and it stomped on her leg and broke it. But like a real trooper, she returned to work after a two-episode absence, but had to spend a lot of time behind a bar counter so viewers wouldn’t notice she broke her leg.

During the accident, a horse tried to jump over Cuoco and it stomped on her leg and broke it. But like a real trooper, she returned to work after a two-episode absence, but had to spend a lot of time behind a bar counter so viewers wouldn’t notice she broke her leg.

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Did Penny share Leonard’s sentiments about having children someday?

  • Yes
  • No
  • She wasn’t sure

When Leonard originally brought up the subject, she told Leonard that she wasn’t sure if she wanted to have kids, which concerned Leonard as he wanted to have kids. But towards the end of the series, viewers learned that Penny was pregnant and was actually happy about it.

When Leonard originally brought up the subject, she told Leonard that she wasn’t sure if she wanted to have kids, which concerned Leonard as he wanted to have kids. But towards the end of the series, viewers learned that Penny was pregnant and was actually happy about it.

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There’s something wrong with Leonard's glasses, but most people totally missed it.

  • They’re the wrong prescription
  • There aren’t any lenses
  • The frames are the wrong color

Actor Johnny Galecki, who played Leonard, had to remove the lenses because Jim Parsons is taller than him. So, whenever he looked up at him, the lenses would reflect the set lights which ruined the shot.

Actor Johnny Galecki, who played Leonard, had to remove the lenses because Jim Parsons is taller than him. So, whenever he looked up at him, the lenses would reflect the set lights which ruined the shot.

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When did Penny learn that Leonard had cheated on her?

  • Never
  • After the wedding
  • When they decided to elope

Leonard confessed to Penny that he slept with someone else. Although Penny was initially thrown by the confession, she forgave him because they hadn't gotten engaged yet.

Leonard confessed to Penny that he slept with someone else. Although Penny was initially thrown by the confession, she forgave him because they hadn't gotten engaged yet.

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Which “Star Trek: The Next Generation” actor appeared on the show more than once?

  • LeVar Burton
  • Gates McFadden
  • Patrick Stewart

Best known for playing Geordi LaForge on “Star Trek: The Next Generation,” Burton has guest-starred several times on “The Big Bang Theory” during seasons 4, 6 and 8. In one episode, he appeared on Sheldon’s YouTube show “Fun With Flags” to talk about “Star Trek” flags.

Best known for playing Geordi LaForge on “Star Trek: The Next Generation,” Burton has guest-starred several times on “The Big Bang Theory” during seasons 4, 6 and 8. In one episode, he appeared on Sheldon’s YouTube show “Fun With Flags” to talk about “Star Trek” flags.

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Was actor Jim Parsons as big of a sci-fi fan as his character, Sheldon Cooper?

  • Yes
  • No
  • He was only a Trekkie

In fact, Parsons had never seen a single episode of “Doctor Who” or “Star Trek.” He actually wasn't much of a sci-fi fan at all. But he did an amazing job of fooling audiences into thinking that he was his alter ego, Sheldon Cooper.

In fact, Parsons had never seen a single episode of “Doctor Who” or “Star Trek.” He actually wasn't much of a sci-fi fan at all. But he did an amazing job of fooling audiences into thinking that he was his alter ego, Sheldon Cooper.

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This “Roseanne” actress recurred on “The Big Bang Theory” and has a connection to Johnny Galecki.

  • Sara Gilbert
  • Roseanne Barr
  • Sarah Chalke

On the sitcom “Roseanne,” Sara played Darlene Conner, who was also the girlfriend and eventual wife of Johnny Galecki’s character David Healy. Sadly, when the “Roseanne” revival aired, viewers learned that David and Darlene had broken up.

On the sitcom “Roseanne,” Sara played Darlene Conner, who was also the girlfriend and eventual wife of Johnny Galecki’s character David Healy. Sadly, when the “Roseanne” revival aired, viewers learned that David and Darlene had broken up.

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Did Penny have more than one purse on the show?

  • Yes
  • No
  • Not exactly

Penny used the same purse throughout most of the series. In fact, the purse viewers saw her with since the second episode of the first season is the same purse they see her with all the way up to the final episode.

Penny used the same purse throughout most of the series. In fact, the purse viewers saw her with since the second episode of the first season is the same purse they see her with all the way up to the final episode.

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While Sara Gilbert appeared as Dr. Leslie Winkle, another “Roseanne” alum recurred on “The Big Bang Theory,” too. Who was it?

  • Lecy Goranson
  • Laurie Metcalf
  • Heather Matarazzo

Although she was just a recurring character, she played a very important role on the show as Sheldon’s mother, Mary Cooper. Her first appearance was in episode four of season one.

Although she was just a recurring character, she played a very important role on the show as Sheldon’s mother, Mary Cooper. Her first appearance was in episode four of season one.

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Did the actress who played Amy ever work with another “The Big Bang Theory” actor before the show?

  • Yes
  • Never
  • Um, maybe?

Long before “The Big Bang Theory,” Mayim Bialik, who played Amy, had her own show called “Blossom.” And during one episode, Johnny Galecki, aka Leonard, guest starred. In fact, it was one of his first roles on television.

Long before “The Big Bang Theory,” Mayim Bialik, who played Amy, had her own show called “Blossom.” And during one episode, Johnny Galecki, aka Leonard, guest starred. In fact, it was one of his first roles on television.

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Long before he made a spectacle of himself, this popular film and television actor made an appearance in season two. Who was it?

  • William Shatner
  • Whoopi Goldberg
  • Charlie Sheen

He appeared in season two, episode four as himself. In the episode, Raj runs into Sheen at a bar and tells him he’s going to be on the pages of People magazine. But viewers will also note that Sheen was also starring on another Chuck Lorre series called “Two and a Half Men” at the time.

He appeared in season two, episode four as himself. In the episode, Raj runs into Sheen at a bar and tells him he’s going to be on the pages of People magazine. But viewers will also note that Sheen was also starring on another Chuck Lorre series called “Two and a Half Men” at the time.

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In one episode, Sheldon and Amy talk about what couple costumes they should use for Halloween. What was one of Amy’s more interesting suggestions?

  • Kirk and Spock
  • Kim and Kanye
  • Blossom and Joey

Blossom and Joey were brother and sister on the 1990’s show “Blossom,” where Mayim Bialik played Blossom. Joey was played by dreamy actor Joey Lawrence. The writers wrote that line as a salute to Bialik’s time on the show.

Blossom and Joey were brother and sister on the 1990’s show “Blossom,” where Mayim Bialik played Blossom. Joey was played by dreamy actor Joey Lawrence. The writers wrote that line as a salute to Bialik’s time on the show.

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What is Sheldon Cooper's favorite cartoon theme song?

  • Thundercats
  • Ben 10
  • Teenage Mutant Ninja Turtles

In the episode “The Fish Guts Replacement,” Sheldon Cooper shared that his favorite animated theme song was from the popular cartoon “Teenage Mutant Ninja Turtles,” which was written by “The Big Bang Theory” creator Chuck Lorre.

In the episode “The Fish Guts Replacement,” Sheldon Cooper shared that his favorite animated theme song was from the popular cartoon “Teenage Mutant Ninja Turtles,” which was written by “The Big Bang Theory” creator Chuck Lorre.

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Did Jim Parsons really know how to play the theremin?

  • No, but he faked it well
  • Yes
  • Sheldon wasn’t the one who played it

When viewers saw Sheldon Cooper playing the musical instrument known as a theremin, they were actually listening to actor Jim Parsons playing it. It turns out that he can play this instrument that doesn’t require physical touch to play.

When viewers saw Sheldon Cooper playing the musical instrument known as a theremin, they were actually listening to actor Jim Parsons playing it. It turns out that he can play this instrument that doesn’t require physical touch to play.

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Which Terminator actress appeared in one episode?

  • Summer Glau
  • Linda Hamilton
  • Kristanna Loken

The “Terminator: The Sarah Connor Chronicles” actress is best known for her role as the reprogrammed Terminator Cameron who goes back in time to save John Connor. Well, in season 2, episode 17, the guys from “The Big Bang Theory” run into Glau on a train and try hitting on her; except for Sheldon, of course.

The “Terminator: The Sarah Connor Chronicles” actress is best known for her role as the reprogrammed Terminator Cameron who goes back in time to save John Connor. Well, in season 2, episode 17, the guys from “The Big Bang Theory” run into Glau on a train and try hitting on her; except for Sheldon, of course.

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A new species of bee was named after one of the show’s most popular catchphrase. What was the catchphrase?

  • Scissors cut paper
  • I’m not crazy
  • Bazinga!

In 2012, biologists identified a new species of bee which they named Euglossa Bazinga. The name was chosen in honor of “The Big Bang Theory.” Now hardcore fans will recall that Bazinga was Sheldon’s catchphrase, but he was also deathly allergic to bee stings.

In 2012, biologists identified a new species of bee which they named Euglossa Bazinga. The name was chosen in honor of “The Big Bang Theory.” Now hardcore fans will recall that Bazinga was Sheldon’s catchphrase, but he was also deathly allergic to bee stings.

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What was Sheldon’s sister like on “The Big Bang Theory?”

  • She was brainy
  • She was the total opposite of her brother
  • She was a mean girl

Missy was played by actress Courtney Henggeler, and she was Sheldon’s twin sister. But she was not a total brainiac like her brother, and yet that didn’t stop her from being proud of Sheldon’s achievements.

Missy was played by actress Courtney Henggeler, and she was Sheldon’s twin sister. But she was not a total brainiac like her brother, and yet that didn’t stop her from being proud of Sheldon’s achievements.

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Did the country Belarus try ripping off the concept of “The Big Bang Theory?”

  • Yes
  • No
  • Where’s Belarus?

A TV show called “The Theorists” aired in Belarus and it was a total knock-off of “The Big Bang Theory” in the United States. For one thing, they had a blonde neighbor who looked a lot like Penny. They also had two characters named Sheldon and Raj who were scientists along with two other friends named Leo and Hovart.

A TV show called “The Theorists” aired in Belarus and it was a total knock-off of “The Big Bang Theory” in the United States. For one thing, they had a blonde neighbor who looked a lot like Penny. They also had two characters named Sheldon and Raj who were scientists along with two other friends named Leo and Hovart.

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Which actor from “Battlestar Galactica” appeared on the show?

  • Edward James Olmos
  • Jamie Bamber
  • Katee Sackhoff

Known best for her role as Starbucks on “Battlestar Galactica,” Katee appeared in the same uniform she used on the sci-fi series during one of Howard’s fantasies. She later appeared with him in the bathtub. But it wasn’t a one time gig. The actress has appeared in season three and season four episodes.

Known best for her role as Starbucks on “Battlestar Galactica,” Katee appeared in the same uniform she used on the sci-fi series during one of Howard’s fantasies. She later appeared with him in the bathtub. But it wasn’t a one time gig. The actress has appeared in season three and season four episodes.

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What particular item popped up in the 100th episode that had viewers experiencing déjà vu?

  • Star Trek Tricorder
  • Penny’s shirt
  • Superman action figure

In the 100th episode, we see Penny wearing the exact same top that she had on in the pilot episode. Coincidentally, this was the episode where Leonard asked Penny out again after the two lovebirds had taken a break.

In the 100th episode, we see Penny wearing the exact same top that she had on in the pilot episode. Coincidentally, this was the episode where Leonard asked Penny out again after the two lovebirds had taken a break.

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Which Buffy the Vampire Slayer star played an FBI agent on the show?

  • Sarah Michelle Gellar
  • Eliza Dushku
  • Alyson Hannigan

While most Buffy fans know her as Faith, the rogue slayer who went bad in season three but eventually had a change of heart, Eliza played FBI agent Angela Page in season 4, episode 7. Page’s role was to interview Howard and his friends to see if he was qualified to get the proper clearance to perform government work.

While most Buffy fans know her as Faith, the rogue slayer who went bad in season three but eventually had a change of heart, Eliza played FBI agent Angela Page in season 4, episode 7. Page’s role was to interview Howard and his friends to see if he was qualified to get the proper clearance to perform government work.

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There’s something funny during the show’s end credits that's also a blink and you’ll miss moment, what is it?

  • Funny drawings
  • Bloopers
  • Vanity cards

Chuck Lorre posts a series of vanity cards during the end credits of each episode that are either goofy and funny or just downright serious. But he doesn’t just do this on “The Big Bang Theory.” He incorporates these vanity cards in the end credits of other shows he produces, too.

Chuck Lorre posts a series of vanity cards during the end credits of each episode that are either goofy and funny or just downright serious. But he doesn’t just do this on “The Big Bang Theory.” He incorporates these vanity cards in the end credits of other shows he produces, too.

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