Catapult, balloon full of water, aim, fire!

The catapults are very easy to use : there are four small shelters on each side of the court each with a strange cone attached by large elastic bands; position the balloon* filled with water in the cone.  The cone becomes a water catapult and the game consists of aiming so your balloon explodes in your friend’s face!  You really must try it, it’s heaps of fun!
(*10 ballons : 1€)

see video