Bheja fry question

 This bheja fry question I recently heard on web radio.

Question

Einstien meets a common man.

Einstein says to common man  ,

" Let's make a deal.

   You ask a question.

    If I am unable to answer , I will give you 500 dollors.

    Similarly  , if you are unable to answer my question  , you               just  have to give me 5 dollors. "

Common man agreed.

Einstein asked common man to ask the question first.

Common man asked ," What is it when going up , has 4 legs ; coming down has only 3 legs  ???"

Eienstein thought and thought ......

He could not guess the answer.

Accepting his defeat , Einstein gave 500 dollors to common man.

After that  , Einstein asks the common man to tell the answer .

Common man gave 5 dollor out of 500 dollor to Einstein ,said

" Even I dont know   !!!!"

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Einstein shocks

Common man rocks    !!!!!!!!