An arrogant rich man on a plane gets bored and tells the man in the seat next to him, "Let's play a game...I'll ask you a question. If you can't answer it you give me five dollars. Then you ask me one. If I can't answer I'll give you five hundred dollars. Is it a bet?"
The man thought for a moment and nodded.
The rich man said, "How far's the moon from the Earth?"
The man thought a moment and said, "I don't know the exact distance."
He reached in his pocket and handed the rich man five dollars...