A mechanic was removing a cylinder-head from the motor of a Harley motorcycle when he spotted a well-known cardiologist in his shop.
The cardiologist was there waiting for the service manager to come and take a look at his bike 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 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, took the valves out, repaired any damage, and then put them back in, and when I finish, it works just like new.
So how come you get the really big bucks when you and I are doing basically the same work?' The cardiologist paused, smiled and leaned over, then whispered to the mechanic...
'Try doing it with the engine running.'