Cardologist and auto mechanic (joke)
An auto mechanic was removing a cylinder head from the engine of a car when he spotted a well-known cardiologist in the shop.
The cardiologist was there waiting to talk with the service manager when the mechanic shouted across the garage,
"Hey Doc, wanna take a look at this?"
The cardiologist, a bit surprised, walked over to where the mechanic was working. 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 or replace anything damaged, and then put everything back in, and when I'm finished, it works just like new. So how is it that I make $24,000 a year and you make $1.7M when you and I are doing basically the same work?"
The cardiologist paused, leaned over, and then whispered to the mechanic.... "Try doing it with the engine running."