@ #1 that was good i would try it on my girlfriend but she would have to google it to work out the answer ... girls are funny little things are they not?
That, my friend, deserves a slow clap of grudging respect. I got a D in Biology, as in "Dumbass". Or, "Don't think that just because you see your male teacher out and about in town wearing tiny lycra hotpants that means he'll give you a good grade to keep you quiet".
Highly disturbing. I had a high school teacher that was a cross-dresser, a few of my classmates saw him at a local mall in a dress, full make-up, etc. He "transferred" shortly after that.
Getting back on "nerd jokes," I came up with this one the other day:
If your quantum physicist girlfriend says, "Our overlap matrix has non-trivial off-diagonal elements," she's telling you she's pregnant... or that she's discovered you're blood-related.