The other important thing for a good Halloween party are aliens. Our party had 2 "visitors" to help spice things up.
The cherry on top though was fully costumed Wiffle Ball followed by fully costumed karaoke. Of course if you're going to do either of those things properly it's important to have strong bones. The partygoer on the left made sure her bones were ready for the challenge with a liter of milk before the game. Her costume strangthened a few bones around her as well, but that's another story.