Stardom is a funny thing. Though a star can earn worldwide celebrity through talent, beauty, or even YouTube videos, that gift does not always translate well to the big screen. Just ask these folks. All of them earned a large degree of celebrity before trying their hand at acting, and all failed miserably when it came to the movies. These celebrities that tried acting and failed serve as cautionary tales to anyone else who thinks acting just means saying lines in front of a camera.