The Ferret Cannon (also known as the Ferret Bazooka and Plan B) is a rather simple device created by Bun-Bun.
The weapon consists of a cardboard tube open at one end and some sugar. The idea is to shove Kiki in the tube and feed her the sugar, which causes her to race out of the end of the tube at supersonic speeds. It has only been used once to any great effect, against Santa Clause. It worked remarkably well, as it managed to take out his sleigh.