Santas Hat

You can start this game as guests enter the party.As each person enters the room, hand them a Santa hat and instruct them to keep it on until they see you take yours off.Once everyone is wearing a hat, mingle and engage in conversation until everyone starts to forget about the game. Once your guests are distracted, quietly remove your hat and wait to see who catches on and does the same.The last guest to have his hat on is the loser, and can be the one to start the next round.