Dear Mr. Potter, The Ministry has received intelligence that at 6:23 this evening you performed the Patronus Charm in the presence of a Muggle. As a clear violation of of the decree for the reasonable restriction of underage sorcery, you are hereby expelled from Hogwart's School of Witchcraft and Wizardry.
I've whipped up this nasty little soirée over at his friend Wyatt's house. –Soir-what? –Soirée, honey. I think that means, um, 'party.' –Party. You know, there's going to be sex, drugs, rock-n-roll... chips, dips, chains, whips... you know, your basic high school orgy-type of thing. I mean, uh, I'm not talking candle wax on the nipples or witchcraft or anything like that. No, no, no. No, just a couple of hundred kids running around in their underwear acting like complete animals.