A marvelous answer
        
        Take a look at this marvelous answer:
        A mechanic was removing the cylinder heads from the motor of a car when
        he spotted the famous heart surgeon in his shop, who was  standing off
        to the side, waiting for the service manager to come to take a look at
        his car.

The mechanic shouted across the garage,"Hello Doctor!
Please come over here for a minute." The famous surgeon, a bit
surprised, walked over to the mechanic. The mechanic straightened up,
wiped his hands on a rag and asked argumentatively, "So doctor, look at
this. I also open hearts,  take valves out, grind 'em, put in new parts,
and when I finish this will work as a new one. So how come you get
the big money, when you and me is doing basically the same work? " The
doctor leaned over =nd whispered to the mechanic ..... What  did he say ???

       
        Guess ......
       
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        He said : "Try to do it when the engine is running".