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 opened its heart took the valves out, repaired or replaced anything damaged, and then put everything back in, and when I finished, it worked just like new. So how is it that I make $48,000 a year and you make $1.7 million 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."
Now that is among my five most favorite jokes I have heard in my long life.
I wish I had kept track over the years; what the others are, I will recognize when I hear them again.