Just got back from the dentist's (where I did NOT say, "Sing, dentist") and whilst in the waiting room, I glanced at a magazine that had an excerpt from Ed McMahon's book about Johnny Carson. McMahon tells about a very young Johnny Carson, lying on the floor, covering his eyes with his hands, listening to Jack Benny. According to the book, on one of the occasions, Carson said to himself, "This is it. This is what I want to do. I want to make people laugh like that."
Nice little story.