Most Dangerous Object in the Office: Pocket Artillery Mini Cannon

Ooh, the action figures adorning your cubicle are soooo scary with their injection-molded plastic biceps and weaponry. Whatever. This 2-inch muzzle-loading desk cannon actually fires micro munitions. Pack a couple of grains of black powder into the stainless steel miniblaster, light a real 2-mm fuse, and it'll launch .177-caliber BB's up to 100 yards. OK, it may be considered a firearm in your state, but it's worth taking a few gun-safety classes to be able to reduce G.I. Joe figurines to plastic confetti.