A lawyer and a blonde sit next to each other on a long flight from Los Angeles to New York

A lawyer and a blonde sit next to each other on a long flight from Los Angeles to New York. The lawyer leans over to her and asks her if she would like to play a fun little game. The blonde is tired and only wants to take a nap, so she declines politely and turns to the window to slumber. The lawyer persists and says that the game is really easy and very fun. He explains how the game works:
? I ask you a question and if you do not know the answer you pay me and vice versa.

Still, she declines politely and tries to get some rest. The chauvinist lawyer figure that since his opponent is a blonde he will easily win the match, so he makes another offer:

? OK, yes. What do you think, if you do not know the answer you will pay me only 5?, But if I do not know the answer, will I pay you 50?

This grabs the attention of the blonde and thinks that there will be no end to this torment unless she plays and she agrees to play the game. The lawyer asks the first question.
? What is the distance between the earth and the moon?

The blonde does not say a word. She puts her hand to her purse, takes out a note of five? and give it to the lawyer. Now it's the turn of the blonde. She asks the lawyer:
? What goes up a hill with three legs and comes back with four?

The lawyer looks at her with puzzlement. He takes his laptop and looks in all his references. It connects to the internet with its modem and cell phone. He researches on the internet and even at the Library of Congress. Frustrated, he sends emails to all his colleagues and friends he knows. After an hour, he finally gives up looking for the answer. He wakes the blonde and gives him 50? The blonde takes the 50? politely and turns to go back to sleep. The lawyer who is more than a little frustrated, wakes the blonde and asks:

? Well, so what's the answer?

Still without a word, she carries her hand to her wallet and gives 5? to the lawyer and she goes back to sleep.
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