Also when other people do it! It doesn't even have to be pretty! That's why I kinda hate clubs... there everyone is all about "who's the prettiest" XD.
And that, my dear fellow fanpoppers, is why there are days where your parents aren't home...
...so that anda can throw a party! =D
(but for the small kids(because I don't want to be a bad influence), listen to your folks :P)