Busting out a shaving cream pie to make a point is downright unwieldy, but Instructables has plans up for a toy pneumatic gun that can shoot cartridges filled with tar and feathers. Now that just makes good sense. More »
Ping pong balls are relatively harmless, most of the time. Even if someone slams one at you with a paddle, it never hurts all that much. This pneumatic cannon changes that. [TinyEnormous via Make]
