2 February 2014, 20:10
A 'mace' made from a tightly (pliers and gloves must(!) be used here, please - playing hero while making one of these makes you a blood donor every 40 seconds, or so) compressed ball of barbed wire will definitely ruin somebody's day!
Sign on my back door: "Dear Burglar: Name anybody who will be looking for you beneath my floorboards!"