A potato cannon (also known as a spud gun or 'spudzooka') is a pipe-based cannon which uses air pressure (pneumatic), or combustion of a gaseous fuel, to launch projectiles at high speeds. They are built to fire chunks of potato, as a hobby, or to fire other sorts of projectiles, for practical use. The projectile can be dangerous and result in life-threatening injuries, including cranial fractures, if a person is hit. All spud guns propel projectiles down their barrels using pressurised gas in the same manner as a firearm (although at a much lower pressure).
Contributions by Tom harrison, Statsone, and AntiVandalBot.