A mechanic was removing a motor of a Ford Mustang when he spotted a well-known heart surgeon in the garage. The surgeon was waiting for the service manager to take a look at his car.
The mechanic shouted across the garage: "Hey Doc, can I ask you a question?"
The surgeon, a bit surprised, walked over to where the mechanic was working. The mechanic straightened up, wiped his hands on a rag and asked, "Doc, look at this engine. I open its 'heart', take valves out, fix'em, put'em back in; and when I finish, it works just like new. So how come I get such a measly salary and you get the really big bucks when you and I are doing basically the same kind of work?"
The surgeon paused, smiled, leaned over and whispered to the mechanic, "Try doing it with the engine running."