Einstein and Mr. Bean sitting next to each other on a long flight. Einstein says, “Let’s play a game. I will ask you a question, if you don’t know the answer, you pay me only $5 and if I don’t know the answer, I will pay you $500.”
Einstein asks the first question: What’s the distance from the Earth to the Moon?
Mr. Bean doesn’t say a word, reaches his pocket, pulls out a $5.
Now, it’s Mr. Bean’s turn.
He asks Einstein: What goes up a hill with 3 legs and comes down on 4 legs?
Einstein searches the net and asks all his smart friends. After an hour he gives Mr. Bean $500.
Einstein going nuts and asks: Well, so what goes up a hill with 3 legs and come down with four?
Mr. Bean reaches his pocket and give Einstein $5.