Galaga Guy – The Avengers
In The Avengers, the MCU’s first (and wildly successful) attempt at a cinematic universe crossover, Tony Stark casually laments that one of the S.H.I.E.L.D. workers is just playing Galaga. Joss Whedon then cuts to the worker, who shifts around guiltily while, indeed, playing the game. It’s incredibly funny, and completely unscripted. That’s right — this actor was just behaving that way naturally, and Whedon added the Galaga screen in post-production to justify it.