William Wyler has always been famous for taking a lot of takes. There is this story that he did this scene with a bunch of very competent people, a very important scene in the movie, and he'd already done it thirty times. One of them came to Willie and said, 'I want to know what we're doing wrong. What do you want us to do?' And Willie said, 'No, you're doing it fine. I'm just waiting for something to happen'.