Just try it…

A mechanic was removing a cylinder head from the motor of a Harley, when he noticed a world-famous heart surgeon in the shop. The surgeon was waiting for the service manager to take a look at his motorcycle

The mechanic called the surgeon over and said, "Hey doc, look at this engine. I can open it up, take valves out, fix'em, put in new parts and when I finish it will work just like a new one. So how come I get a pittance and you get the really big money, when you and I are doing basically the same work?"

The surgeon smiled and said to the mechanic, "Try doing it while it's running."

…hat tip to Wes Peterson