Morris, the loudmouth mechanic, was removing the cylinder heads from the motor of a car when he spotted a famous heart surgeon who was standing off to the side, waiting for the service manager to come take a look at his Mercedes.
Morris shouted across the garage, "Hey Doc! Is that you? Come on over here a minute."
The famous surgeon, a bit surprised, walked over to where Morris the mechanic was working on the car.
Morris straightened up, wiped his hands on a rag, and asked argumentatively, "So, Mr. Fancy Doctor, look at this here work. I ALSO open hearts, take valves out, grind 'em, put in new parts; and when I finish, this baby will purr like a kitten. So how come you get the big bucks, when you and I are doing basically the same work?"
The surgeon leaned over and whispered to Morris the loudmouth mechanic, "Try doing it with the engine running."
(from Mikey's Funnies)