Einstein vs. Mr. Bean

Einstein and Mr.Bean sitting next to each other on a long flight.

Einstein says, "Let's play a game. We ask each other questions, if you don't know the answer, you pay me only R50 and if I don't know the answer, I will pay you R5000"

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, and pulls out a R50.

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 R5000.

Einstein going nuts and asks: "Well, so what goes up a hill with 3 legs and comes down with 4?

Mr.Bean reaches his pocket and gives Einstein R50....