A blonde and a lawyer sit next to each other on a plane. The lawyer asks her to play a game. If he asked her a question that she didn't know the answer to it, she would have to pay him five dollars. And every time the blonde asked the lawyer a question that he didn't know the answer to it, the lawyer would have to pay the blonde 20 dollars. So the lawyer asked the blonde his first question, "What is the distance between the Moon and its nearest star?" Without a word the blonde pays the lawyer five dollars. The blonde then asks the lawyer, "What goes up a hill with four legs and down a hill with three?" The lawyer thinks about it, but finally gives up and pays the blonde 20 dollars. Then the lawyer asked her what the answer was and without a word the blonde gave the lawyer five dollars.