We have a saying here at Zprepared.com: Never bring a knife to a Zombie fight. If you absolutely have to, the WASP Injection Knife is definitely the blade to bring. Made from surgical stainless steel, this 11 1/4″ knife comes equipped with a handle that holds an up to 24g gas cartridge. With a push of a button, a burst of cold compressed air about the size of a basketball is ejected out of the blade. Originally designed for divers to use against sharks, this nifty weapon has the potential to be a decent back-up, back-up weapon. If your back’s against the wall, and all other options are spent, just drive this sucker into a Zeddy’s head and just push the button. Just make sure your eyes and mouth are closed.