We were at the bar after work on Friday and there was a classic.
Coworker A said - When I first saw the t-shirt "Chicks dig UNIX" I thought it was one of the funniest things ever.
Female Coworker B who is Swiss asks is this funny. I explain it is a pun - Eunuchs - UNIX.
Coworker A says - Ohhhhhhhhhhhh. I didn't think of that.
Now that's one of the funniest things ever :-)