So...recently I was sitting on an airplane next to a guy who turned out to be a lawyer. I just wanted to sleep, but this guy wanted to prove how smart he was. He wouldn't leave me alone. Finally he offered me a challange: "We'll ask each other questions. For every question I ask you and you can't answer, you'll give me $5. And for every question you ask me that I can't answer, I'll give you $500." Well, I said "Sure." "I'll start," he said. "What is the distance between the earth and moon." "Dunno," I said. "I owe you five bucks. My turn...what goes up a hill with three legs, and comes down with four?" "I'll have to think about that," he said. In the meantime, I got in an hour and half of sleep while he pondered it. Finally, I heard the pilot announce we were about to land, and it woke me. "OK, I give," said the lawyer. "Here's your five hundred dollars. What's the answer to your question?" "Dunno," I said, "Here's another five. Been nice talking with ya."