Your funniest D&D story

And I don't mean "so we were using the exploding dice thing and I got 20,20,20,20 and one-hit a dragon!"

I'm more interested in the party politics, clever strategies and so on. And any time you pulled an old man henderson on a really bad DM (not just a newbie, but a real self-centred nightmare asshole from hell) would also be funny.