It’s no secret that Heath Ledger took extra steps to be as convincing as possible when playing the Joker in The Dark Knight, but what’s amazing is that he managed to scare his co-stars on set. In the scene where Joker and his cronies crash Bruce Wayne’s party, Alfred, portrayed by Michael Caine, is right there to stop them at the elevator, but instead, he steps away in horror. Caine was actually supposed to deliver a few lines, but it was his first time seeing Ledger in character, which scared him so much, he couldn’t utter a single word.