If the cost of all that hairspray and sacks of potatoes is cramping your spud gun shooting style it might be time to build this air-powered cannon that can shoot water balloons, potatoes, steel spikes, and more.
[Ed. Note: The video above has some slightly NSFW (if very excited) language. If you're watching in your cube you might want to turn the volume down.]
Drew Pilcher, a DIYer, lover of dangerous hobbies, and college student, shares a great set of photos, videos, and plans on how to build your own air-powered cannon. Leave the hairspray cans at the store and turn some PVC, valves, scrap wood, and other hardware store parts into a cannon capable of laying even the hardiest of targets to waste.
Pilot Valve Air Cannon [Wolf's Projects via Hack a Day]