Einstein: I will you a question, and you will give a question to me as well. If you can't answer my question, you'll give me 1 dollar, and if I can't answer your question I will give you 1000 dollar.
Mr. Bean: OK
Einstein: (gives Mr. Bean a hard question)
Mr. Bean: (gives one dollar to Einstein)
Einstein: Okay, 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 five legs?
Einstein: (thinking very hard) I give up. I can't answer that. (gives 1000 dollar to Mr. Bean)
Einstein: But what animal is that Mr. Bean?
Mr. Bean: (gives 1 dollar to Einstein)
