Here's a great way to start off the week from Ragan's PR Daily: "A PR pro walks into a bar..." where you'll find several humorous PR-related jokes.
And, since I am just now finishing editing Beth Kanter and Katie Paine's upcoming book Measuring the Networked Nonprofit, I found this one about writers and editors especially appealing/appalling:
On writing and editing
A writer and an editor are making their way through the desert. The sun is beating down, and they're parched beyond belief. Up one dune and down the next they go—walking, stumbling, crawling. Just when they're about to give up, they look over a sandy crest and see an oasis.
Revitalized, they stagger toward it, with the writer leading the way. He lands face first at the edge of the cool water, cups his hands, and drinks.
Suddenly, a few feet to his left he hears a soft splashing sound. He looks over and sees that the editor is peeing into the water.
In stunned disbelief, the writer yells, “What the hell are you doing?”
The editor, without even looking up, says calmly, “I'm making it better.”
Go read them all. -- Bill Paarlberg, editor
(thanks to dispair.com for the illustration)