Einstein vs. Mr. Bean

Einstein: I will give you a question, and you will give a question to me as well. If you can't answer my question, you will give me $1, and if I can?t answer your question, I will give you $1000

Mr. Bean: Okay

Einstein: (Gives Mr. Bean a hard question)

Mr. Bean: (Give $1 to Einstien)

Einstein: Okay, now your turn.
Mr. Bean: What is the animal that has 4 legs, and when he crosses a street he only has 2 legs, and when he goes back, he has 5 legs?

Einstein: (Thinking very hard) I give up. I can't answer that. (Einstein gives Mr. Bean $1000)
Einstein: But what animal is that, Mr. Bean?
Mr. Bean: (Gives $1 to Einstein)