How to Make a Water Balloon Launcher?

In order to make a water balloon launcher you will need an old towel and exercise tubing or surgical tubing, cut the towel so it is a pocket for the balloon, lay a piece of wood on the tabs, fold the towel over the wood and put duct tape on it so that the wood is inside, tie the tube ends to a tree or pole, fill up your balloons, put it inside the pocket and pull it back and watch it go.