Divide the group into pairs. Then group the pairs into equal teams. So for example you might have two teams of 4 with each team having two pairs. Give each team a plunger. Place partners from each pair across the room from each other. Have one partner place the plunger between their legs with the stick pointing outwards and the other partner place the roll of toilet paper between their legs with the hole pointing outwards. Say go! The object is to place the stick inside the hole of the toilet paper without using any hands. Get ready to laugh! After one pair has managed to do it, the next pair must do it. First team to complete the task wins.