having problems with the bike

On one day, there are five young's men are walking. on the way, they meet someone who is having problems with the bike.

 
then they approached him and asked," good morning, what's happen with the bike, sir?
The father then said, "my bike cannot live!. I have tried for more several times, but it stays like this!".

then one of the five youngs men are asked again: "Ooo...eee...!! sir, because this bike cannot live, how if I exchange this bike with my shoes ?"

 
Hearing the question, then the Mr. say, "what..!! are you stupid guys ?? only a fool men would want to exchange here bike with the shoes. "

Hear that,  the young man answered like this : "I'am sorry sir, We just ask it, who knows mister of a fool because wanting to exchange the bike with a shoes .. hahaha ..!. Then the young men ran to leave the old men!