BarCamp - How to Run Your Own/Special surprises

It's always good to have something special on the barcamp, here's some of the thing people have done in the past to make their barcamps that little more extra special.
 * Games
 * Werewolf/Mafia - Theres a rich tradition of introducing people to Werewolf in BarCamps in the UK
 * Card and board games are also a good thing to play.
 * Midnight surprise
 * Popcorn, Pancakes and a Chocolate Fountain at BarCampLondon3
 * Krispy Kreme donuts at BarCampLondon6
 * Massive video game
 * Rock band and Wii sports on a massive screen at barcampmanchester2