Bicycle Boy

Two mathematicians are at a bar having drinks. The first one laments that the average person knows very little about math. The second one disagrees, and they argue over this point for a while. The first mathematician eventually gets up to use the restroom. While he’s away, the second mathematician calls the waitress over and tells her that, in a few minutes, he’s going to call her over and ask her a question. All she needs to do is respond to it by saying “One third x cubed”. She repeats, with a puzzled look on her face: “One thir...dex cue???” He corrects her: “One third x cubed.” She agrees, and walks away, diffidently repeating to herself “One third...dex cube...One...third dex cube...One third dex…cube.” When the first mathematician returns, the second proposes a bet—that he’ll ask the waitress to solve an integral, and she’ll be able to do it. The first one agrees, and so the second one calls the waitress over and asks her: “What’s the integral of x squared?” The waitress proudly states: “One third x cubed!” As she’s walking away, she looks over her shoulder, smiles, and says: “plus a constant of integration.”