A mechanic was removing the cylinder heads from the motor of a car when he spotted a famous heart surgeon in his shop who was standing off to the side waiting for the service manager to come and take a look at his car.

The mechanic shouted across the garage, “Hello Doctor! Please come here for a minute.”

The famous surgeon, a bit surprised, walked over to the mechanic.

The mechanic straightened up, wiped his hands on a rag, and asked argumentatively. “So doctor, look at this. I also open hearts, take valves out, grind ’em, put in new parts, and when I finish, this will work as well as a new one. So, how come you get the big money when you and me is doing basically the same work?”

The doctor leaned over and whispered to the mechanic, “Try to do it when the engine is running.”