Trick or Treat
Who says trick-or-treating is just for kids? In this game, place miniature drink bottles filled with different concoctions on trays or in bowls around your venue. Guests can then freely pick up any of the drinks to enjoy, but they won't know whether the drink is a trick or treat until after their first sip.
The "treat" bottles can be some sort of alcoholic beverage, while the "trick" ones will simply be juice or water. You can also play this game with jello shots, too!