Doraemon's Air Cannon

Now here's a really fun item -- Doraemon's Kuukihou (Air Cannon)! One of Doraemon's famous recurring gadgets in the anime series and movies, the Air Cannon can be fitted to one's arm and fires a powerful burst of air that knocks out the victim when the user says "bang."

It is mostly used for fighting purposes. It really gives a nice thrash to the opponent.