Young Frankenstein
As a spoof of horror films, this Mel Brooks movie gave its actors leeway. Thus, Marty Feldman, who played Igor, could add as he pleased to his character in Young Frankenstein. So with that freedom, Feldman was able to add the hilarious line, “what hump?” What’s even more hysterical is that he would adjust the hump as he asked this. Mel Brooks loved it so much, he kept the improvised line in the film.
Animal House
Since Animal House came from National Lampoon, it’s not a shocker that the comedian actors improvised throughout the movie. Think back to John Belushi in the cafeteria. That whole famous scene was improvised. Belushi shoved a ton of food in his mouth before squeezing his cheeks. As food flies out, Belushi famously says, “I’m a zit– get it?”