A mechanic was removing a cylinder head from the motor of a 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 and leaned over and whispered to the mechanic ... "Try doing it with the engine running!"