Belly Stabber

... grows to “the size of a basketball” and freezes the victim’s internal organs.

Eek

“ Britain is reportedly on alert for the wasp knife, a knife that can “deliver a ball of compressed gas capable of killing its victim at the press of a button.” A needle in the tip of the knife’s blade shoots out a little frozen gas ball which instantaneously grows to “the size of a basketball” and freezes the victim’s internal organs. [Story] [Video demo] ” On Prozac