Graphing rational functions is a pain in the asymptote.
(Thanks to Desmond for telling this joke!):
Why is Epsilon afraid of Zeta? Because Zeta Eta Theta.
Every proof is a one-line proof, provided you start sufficiently far to the left.
Q: How many light bulbs does it take to change a light bulb?
A: One, if it knows its own Godel number.