One of the perks to not hosting Halloween and going to someone else's party is that you can win the costume contest! Which I did as Marie Antoinette, with boat in sail in my hair and blood at my neck. My friend Shelly won too, as an insanely-realistic Oompa Loompa (in fact, based on the reaction she got, we all thought she was going to win first prize, but that went to two girls dressed as Voodoo practicioners.)
We had a great time at a party in West Oakland with live bands and an indoor half-pipe for skaters, which provided amusing people-watching as women in high heels tried to get pulled up to the top by their guys.
Shelly and I got little trophies with ribbons attached. Mine said "Funniest costume" and hers said "scariest"... I think the awarder randomly pulled them out of his bag.