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 just plain clumsiness. What’s rare are those times that these moments are so good they ended up in the film.
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(In this video, Looper explains great movie scenes that did not go as planned, but ended up even better for it. -via Laughing Squid
Source: neatorama