Okay the combination of this guy and this weapon scares the crap out of me. It's as if the scary neighbour from Home Alone was crossbow-obsessed and got himself a Lego Mindstorms kit.
This huge, motorised crossbow is fully automatic, meaning it automatically loads, cocks, and fires. It doesn't appear to have a huge range, but it's certainly enough to make me glad it's not widely available for sale. [Ubergizmo]