It's amazing to think that some of the most iconic lines and scenes in movie history weren't written in the script. Nope, instead they were improvised by the actors and directors on a whim.

Check out the '25 Greatest Unscripted Scenes in Films' and be surprised at some of what was improvised. I definitely learned about a few I didn't know about.

***WARNING: The scenes are uncensored so this might be NSFW***