Einstein : I will give you a question, and you will give a question to me aswell, if you cant answer my question, you just must give me $1, and if I cant answer your question I will give you $1000
Mr.Bean :
Einstein : (giving Mr.Bean a hard question)
Mr.Bean : (give $1 to einstein)
Einstein : okay your turn
Mr.Bean : what is an animal that has 4 legs, and when he crossing a street he only have 2 legs, and when he go back, he have 5 legs?
Einstein : (Thinking very Hard) I give up, I cant answer that (Einstein give Mr.Bean $1000
Einstein : by the way, what is exactly the animal is, Mr.Bean??
Mr.Bean : (give $1 to einstein)