Here's a nice geeky one:
A woman in liquor production
Owns a still of exquisite construction.
The alcohol boils
Through magnetic coils.
She says that it's "proof by induction."
Here's another for the not-so-geeky among you:
If you catch a Chinchilla in Chile
And cut off its beard, willy-nilly
You can honestly say
That you have just made
A Chilean Chinchilla's chin chilly
Ah yes, good stuff..