When police raided a home in Luleå in northern Sweden last November they discovered a small arsenal of weapons, including a shot-gun built into a guitar. The police had received a tip off that the 54-year-old man was hoarding a bevy of unlicensed firearms in his house and performed a raid. "They are therapy to keep off the drink," the man told police interrogators, according to the local Norrländska Demokraten (NSD). Aside from the six more conventional weapons found in the apartment and a quantity of ammunition, police discovered that a wall-mounted guitar was not quite as it first appeared....