A mechanic was removing cylinder heads from a Zetec engine when he spotted a famous heart surgeon in his shop. The surgeon was standing off to the side, waiting for the service manager to come take a look at his engine. The mechanic shouted across the garage, "Hello, Doctor, please come over 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 I are doing basically the same work?" The doctor leaned over and whispered to the mechanic, "Try to do it when the engine is running."