Divide your group into two teams who sit on opposite sides of the room; each team member is numbered. At each end of the room there is a goal (can be two chairs and a table). In the centre is a balloon and two hockey sticks made up of rolled-up newspaper.
The leader shouts a number and that numbered player from each side runs up, picks up a stick and tries to propel the balloon through the opponents goal. After a goal, or at any time during play, the leader can shout another number; the current players immediately drop their sticks and two new players enter the game and take over. The team with the most goals wins.