Via Metafilter, where I also found out (via email from Jaltcoh) about this amazing website where you can search for phrases in movie and TV scripts. So, for example, it found "Go ahead! Jump!" — or things quite close to that — in 27 phrases from 25 movies, including "Diva" ("Go ahead, jump."), "Back to the Future Part II" ("Go ahead, kid. Jump."), and "Mean Streets" ("Go ahead. Jump out the fuckin' window.")
Oh, I know what I'm going to search for. That line I've heard is in every movie. "2987 phrases from 2252 movies and series..." LOL. Hundreds of movies have it more than once.