
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 come I get such a small salary and you get the really big bucks, when you and I are doing basically the same kind of work?"
The surgeon paused, smiled and leaned over, and whispered to the mechanic..................
"Try doing it with the engine running."