The story of Mr. Bean vs. Einstein Long

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 Einstein a dollar.

Einstein:-

Okay, your turn.

Mr. Bean:-

What is the animal that has 4 legs, and when he crosses a street has only 2 legs, and when he goes back, he has 5 legs.

Einstein:-

Thinking very long 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.