Director Rob Reiner often left the set during Billy Crystal’s scenes because he would laugh so hard that he would feel nauseated, and Mandy Patinkin (Inigo Montoya) claims that the only injury he sustained during filming The Princess Bride was a bruised rib due to stifling his laughter in his scenes with Billy Crystal - who ad-libbed many of his lines including ‘MLT: mutton, lettuce, tomato’ and ‘why don’t you give me a nice papercut and pour lemon juice on it’.