A mechanic was removing a cylinder head from the motor of a Harley motorcycle when he spotted a well-known heart surgeon in his shop. The surgeon was waiting for the service manager to take a look at his bike. The mechanic shouted across the garage, "Hey Doc, can I ask you a question?" The surgeon, a bit surprised, walked over to the mechanic working on the motorcycle. The mechanic straightened up, wiped his hands on a rag and asked, "So 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 and leaned over, and whispered to the mechanic, "Try doing it with the engine running."