Not all guns shoot bullets. There's water guns, t-shirt guns, and confetti cannons. Well, the Harpoon Gun doesn't shoot bullets either. It shoots... harpoons! The Harpoon Gun is especially curious because the ammunition (a large spear) is attached to the gun by a tether. Typically used for fishing for larger species, the Harpoon Gun could also be equipped by aquatic raid teams like the British Commandos pictured here. If you get stuck by one of these, there won't be escape - by design. Ouch!