What is that joke with the astonishingly (and agonizingly) long pun set-up that ends with "if the foo shits..."?

I figure people are volunteering themselves for membership by posting obstreperously prickish things in this thread.

The most obstreperous thing about this whole thread, darling, emanated from the silly sod who started it. Let me remind you that the whole point of the thread was to brand a certain type of, er, anti-establishment poster as "pricks". A really fine thing to do, coming from moderators who are, presumably, supposed to be maintaining standards. Do cast out the mote.