The Princess Bride 

In Rob Reiner’s beloved cult classic The Princess Bride, it has been reported that Billy Crystal wasn’t so good at following his script, preferring instead to improvise lines. While a lot of his ad-libs didn’t make it to the movie, this one did.  

In this scene, Crystal and his wife are wishing the main characters off on their journey. Like parents sending their kids off the camp or school, he perfectly added the line, “Have fun storming the castle!”