We use the Waterballoon Slinghot for all types of contests, such as Color Games, Pirate Raids, and more. You can have accuracy tests or speed shooting contests. We've used them to put out fires. Good fun.
Also, we've gotten a bunch of emails from people who want to buy one - here you go, buy The Ultimate Water Balloon Launcher 400 Yard here.
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Requirements
20 feet surgical tubing, cut into (2) 10-foot lengths