Two mathematicians are in a bar. The first one says to the second that the average person knows very little about basic mathematics. The second one disagrees, and claims that most people can cope with a reasonable amount of maths.
The first mathematician goes off to the restroom, and the other calls over the waitress. He tells her that in a few minutes he will call her over and ask her a question. All she has to do is answer "one third x cubed", and he'll pay her ten dollars.
She repeats "One thir -- dex cue"?
"One third x cubed" he says.
She says, "One thir dex cuebd"?
He thinks that's close enough, and she leaves, repeating to herself, "one thir dex cuebd...".
The first mathematician returns and the second proposes a $20 bet to prove his point, that most people do know something about basic maths. He says he will ask the waitress an integral, and the first laughingly agrees. The second man calls over the waitress and asks "what is the integral of x squared?".
The waitress says "one third x cubed" and while walking away, turns back and says over her shoulder "plus a constant".