Shake or Shoot
Split group into 2 teams. Teams will decide amongst themselves whether they will shake or shoot. Then one representative of each team comes to the centre. They each hold a hand behind their back. On the count of 3 they either hold out a "hand shake" or "gun". 2 Hand shakes: everyone wins. 1 hand shake, one gun: the shooter wins, shaker sits out or joins other team. 2 guns: both sit down.