In the winter it’s snowballs, and in the summer it’s water bombs. Clearly whatever time of year it may be, kids will find something to throw at each other. However, while making a snowball is quick and easy, making a water bomb (or water balloon) can be a laborious process. Unless you have Bunch O Balloons, a system for filling 100 balloons with water in under a minute.
See Gizmag and Kickstarter