
Some of the most unforgettable moments in movies were not planned but improvised. In many cases, actors would respond on the fly or go with their gut, which would result in some unplanned dialogue that would go on to be an iconic part of film history. Moments like these are proof that, when the shot’s being taken, sometimes magic happens, negating what’s actually on paper.
#1: “You’re gonna need a bigger boat.” — Jaws (1975)
Roy Scheider wasn’t just talking about the shark — he was joking about the tiny boat used by the film crew. The line wasn’t scripted, but when Scheider muttered it after seeing the massive great white for the first time, it felt so real that Steven Spielberg kept it.

It perfectly summed up the audience’s own reaction: pure disbelief.
