The Lawyer's Game

A lawyer, sitting next to me on a long flight, was pestering me to play a game.

I ask you a question, and if you don't know the answer, you pay me, and vice versa.

I politely declined and tried to get some sleep. The lawyer made another offer: Okay,

if you don't know the answer, you pay me $5, but if I don't know the answer,

I will pay you $1000. I agreed. The lawyer asked the first question. What's the distance

from the Earth to the Moon? I silently reached into my purse, pulled out a five-dollar

bill, and handed it to the lawyer. Then I asked the lawyer,

What goes up a hill with three legs, and comes down with four? And went back to