The famous surgeon, a bit surprised, came 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 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.