The Observer has a great collection of scientists' favourite jokes, along with anaecdotes and background about each joke. I snorted at this limerick:
From Helen Czerski, Institute of Sound and Vibration Research, Southampton.
A friend who's in liquor production,
Has a still of astounding construction,
The alcohol boils,
Through old magnet coils,
He says that it's proof by induction.
The comments are also a goldmine of science groaners (and pedantic nit-picking). My own favourite -- and original -- science (well, maths) joke is:
There are 10 kinds of people in the world: people who don't know binary, people who do, and people who know ternary.
Please, give us your best science humour in the comments!
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.