My favourite one:
A programmer walks into a bar and asks the bartender for 1.00000000000003123939 root beers. Bartender says, "I'll have to charge you extra, that's a root beer float." Programmer says, "Better make it a double."
A programmer had a problem. He thought to himself, "I know, I'll solve it with threads!". has Now problems. two he
I'd tell you a UDP joke but I'm not sure you'd get it.