Bloopers and Ad Libs that Stayed in the Movies

Sometimes actors go off-script while filming a movie, either intentionally or accidentally. It could be a last-minute idea, a joke, a way to cover up flubbing your lines, or even clumsiness. What's rare are those times that these incidents are so good they ended up in the film. In this video, Looper explains great movie scenes that did not go as planned, but ended up even better for it. (via Laughing Squid)