Famous Movie Lines That Were Actually Improvised
Animal House
Any time that you’re going to direct a film that’s supposed to authentically portray the craziness of college kids, a little improv is going to be in order.
This was the case in the movie Animal House, when John Belushi decided to have some fun at the expense of his fellow cast members.

Animal House
He decided to fill up his cheeks with mashed potatoes and squish it out all over everyone, saying, “I’m a zit – get it?” It was supposed to be just a prank, but it was funny enough to leave in.