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 waiting for the service manager to come take a look at his car.
The mechanic shouted across the garage, "Hello Doctor! Please come on 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 here. 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 both of us are doing basically the same work?"
The doctor leaned over and whispered to the mechanic "Try doing it with the engine running."
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