
http://foundation.luriechildrens.org/goto/benjamin/
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A mechanic was removing the cylinder-head from the engine of a car he was repairing, when he spotted a well-known cardiologist in his workshop.
The cardiologist was there waiting for the service manager to come and take a look at his car when the mechanic shouted across the garage, "Hey Doc, want to take a look at this?"
The cardiologist, a bit surprised, walked over to where the mechanic was working under the bonnet.
The mechanic straightened up, wiped his hands on a rag and asked, "So Doc, look at this engine. I opened its heart, take the valves out, repair any damage, and then put them back in, and when I finish, it works just like new. So how come I make $25 grand a year and you make $500 grand when you and I are doing basically the same work?"
The cardiologist paused, leaned over, and then whispered to the mechanic: "Try doing it with the engine running."