The Parable of the Street Vendor (tl;dr)

[Pokey]

This is a completely true story that I just made up.

There was this street vendor. He was extremely smart -- a savvy businessman, well aware of his revenues and costs, his profits and his results. One day while he was working, two tourists approached him. They were clearly out of their element, knowing nothing about the vending business.

"I'd like a small drink," the first tourist said.

"You are a total moron," the vendor said. "You have no CLUE. The small drink is only 10 cents cheaper than the big drink, but the big drink costs me 40 cents more to make. Only a complete idiot would buy the small drink, and every time you buy that one you just put money into my pocket, stupid."

"Oh! Well, then I'll take the large drink," the tourist said.

The vendor smiled -- he had proven to the first tourist how smart he was.

"I'll have a hot dog," the second tourist replied.

"Geez, what is it, dumb <censored> day today?? Do you know ANYTHING, imbecile? Do you realize that most stores sell hot dogs for 50 cents each? I'm going to charge you $2.50 because you're too dumb to know the difference. God, how could a retard like you even function in a modern society? GEEZ."

"Hmmmm...well, if that's going to be your attitude, then never mind; I'll just leave," the second tourist said.

As he watched the two tourists walk away, the vendor swelled with pride, because he knew that BOTH of the tourists now understood how clever he was.