Hollywood screenwriters toil over what each character in the story will say no matter if they're working on romantic comedies, dramas, and even kids' movies. The lines are then often debated and rewritten many times before, during, and after a movie is shot. But they are not the ones who decide what ends up in the final cut. Directors do. And if they like an improvised scene better than the scripted one, the writers just have to deal with it. It's part of the process. In fact, you'd probably be surprised to know that some really iconic moments in movie history have been authentic. Here are some of them.

In the movie Now You See Me, Isla Fisher's character performs a magic trick that requires her to be in a tank underwater that she needs to escape from. In the scene, she struggles and star

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