"When you realize you want to spend the rest of your life with somebody, you want the rest of your life to start as soon as possible."

Writer Nora Ephron’s first draft didn’t have Sally and Harry ending up together because she considered a breakup to be a more realistic ending. So when it came time to film the revised happy ending, Billy Crystal ad-libbed much of his dialogue with Meg Ryan, including this most remembered line of the picture.