Mary Sue vs. The PPC
I really hope nobody's done this one before; I checked the community memories and didn't find it.
Feel free to slap me if I overlooked it.

It's a slightly older one (from June), but it still makes me laugh every time I read it.
It's not so much that the thread itself is overly wanky, but the Anti-Mary Sue People Are All Losers and Must Suck Really Bad. They burn churches, lynch people and they probably kick puppies too. fic in and of itself warrants at least a mild wank...I think. If not for the whiny story, for the fact that one of the members of the group it came from is the one responsible for getting MSTs pulled from fanfiction.net ^_^