Carl Reiner told the story about how he would dream these great ideas for movies and then forget exactly what they were by morning, remembering only that he had that great idea come to him. So he decides to put a pad and pen next to his bed, and one night he dreams this great idea, wakes himself up and writes quickly, then goes back to sleep, secure that he'd written it down. Then, he looks at it the next morning, and on the pad in clear writing are the words: "Wow, what a great idea for a movie!"