Here you will find a picture of a knife that thinks it's a gun. [Via]
To Britain, where the penchant for stabbing is about to get a whole lot more exciting due to those innovative chaps from across the pond: "Senior police officers have been warned to look out for a new knife which can inject a ball of compressed gas into its victim that instantly freezes internal organs. The 'wasp knife', which can deliver a ball of compressed gas capable of killing its victim at the press of a button, may be heading for Britain, the Metropolitan Police fear. A needle in the tip of the blade shoots out the frozen ball of gas which instantly balloons to the size of a basketball, [...]