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 there waiting for the service manager to come 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 small salary and you get the really big bucks when you and I are doing basically the same work?

The surgeon paused, smiled, leaned over and whispered to the mechanic,"Try doing it with the engine running!"