The plumber comes over and quickly fixes the sink. The professor is happy until he gets the bill. He tells the plumber, "How can you charge this much? This is half of my paycheck." But he pays it anyways.
The plumber tells him, "Hey, we are looking for more plumbers. You could become a plumber and triple your salary. Just make sure you say you only made it to 6th grade, they don't like educated people."
The professor takes him up on the offer and becomes a plumber. His salary triples and he doesn't have to work nearly as hard. But the company...