Jokeing

Over there at the USF Journalism Blog, a former student who now works as a copy editor posted this:

Q: What does a copy editor do when she's not feeling well?

A: Calls inn [sic].

Given the high standards of taste over there, I could not respond with the only copy editing joke I know:

You've heard about the copy editor who gets upset every time she misses a period.

I'm sure there are others, many based on AP style.