I love math jokes. I'm certain I'm alone here, but I came across a website with a bunch of them. Here are my favorites.
This one is a cute little play on proof by induction...
Theorem. A cat has nine tails.
Proof. No cat has eight tails. Since one cat has one more tail than no cat, it must have nine tails.
Q: What is non-orientable and lives in the ocean?
A: Möbius Dick...
HA! Get it?
Statistics Canada is hiring mathematicians. Three recent graduates are invited for an interview: one has a degree in pure mathematics, another one in applied math, and the third one obtained his B.Sc. in statistics.
All three are asked the same question: "What is one third plus two thirds?"
The pure mathematician: "It's one."
The applied mathematician takes out his pocket calculator, punches in the numbers, and replies: "It's 0.999999999."
The statistician: "What do you want it to be?"
Yeah, well, maybe you don't think it's funny, but I do.