A mechanic was removing a cylinder head from the motor of a BMW when he spotted a well-known heart surgeon in his shop. The mechanic shouted across the shop, "Hey Doc can I ask you a question?" The surgeon walked over to the mechanic and the mechanic said, "So Doc look at this engine, I opened it's heart, took the valves out, repaired the damage and put it back together and when I finished it runs like new.
So how come I get such a small salary and you get the big bucks when we basically do the same work?"
The surgeon leaned over and whispered, "Try doing it with the motor running."