He calls a plumber. Plumber shows up, unclogs the toilet and gives the doctor bill for $200.
Doctor: $200? For 15 minutes worth of work? That’s $800 an hour! I’m a top neurosurgeon in this city, 15 years of medical school, 3 years of residence, and even I don’t make $800 an hour!
Plumber: Yeah. When I was a top surgeon in this city I also didn’t make $800 an hour. Which is why I became a plumber.