ah, the crucial difference!

A mechanic was removing a cylinder head from the motor of a Dodge SRT-4 when he spotted a well-known cardiologist in the shop.

The cardiologist was there waiting for the service manager to come take a look at his car 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 SRT.

The mechanic straightened up, wiped his hands on a rag and asked, “So Doc, look at this engine. I open its heart, take the valves out, repair any damage, and then put them back in and, when I finish it works just like new.”

“So how is it I make only $39,000 a year, a pretty small salary, and you get the really big bucks, $1.6 million, 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.”