OK. I have a slightly bizarre of humour, so lets start a jokes thread. Lets try to keep it vaguely keen. And if it takes off, maybe the mods will consider making a sticky.
So...
science based joke:
THE UNIVERSAL INGREDIENTS: time, hydrogen.
Maths based pick up line:
I wish I was your problem set. Because I'd be really hard and you'd be doing me on your desk.
Cowboy(ish) joke:
A dog like into some wild west frontier town, bandage around his foot. Limps into the saloon, says to the barman "I'm lookin' for the man who shot my paw"
OK. I'll stop now.