The story of Mr.Bean vs Einstein

The story of Mr.Bean vs Einstein.

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: OK

Einstein: (Gives Mr.Bean a hard question)

Mr.Bean:(gives $1 to Einstein)

Einstein:Okay, your turn.

Mr.Bean: What is the animal that as 4 leg, and when he crosses a street he as only 2 legs, and when he goes back, he has 5 legs?

Einstein: (Thinking very hard) I give up, I can't answer that(Einstein Give $1000 to Mr. Bean)

Einstein: But what animal is that, Mr.Bean?

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Mr.Bean :(gives $1 to Einstein).