Even though there are plenty examples of mathematical jokes, the mathematical literature is (in many cases) pretty dull. Nevertheless, examples exist in which an essay makes you smile with a nice pun when talking about Galois theory or something...
Can you provide examples of humorous/funny mathematical essays?
EXAMPLE ANSWER
A classical example is the essay "A Contribution to the Mathematical Theory of Big Game Hunting" by Ralph P. Boas (under a pseudonym) which was published in the Mathematical Monthly
UPDATE
Building on the comments by @Ahmed Hussein and @Hans Ludmark there is already a list of colorful language and a list of memorable titles so I changed my question.
Somewhere between a joke and an essay, is Impure Math. http://www.snowman-jim.org/science/humor/impure-math.html