Okay the combination of this guy and this weapon scares the crap out of me. It's as if the scary neighbor from Home Alone was crossbow-obsessed and got himself a Lego Mindstorms kit.
This huge, motorized 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]
DISCUSSION
This isn't a very original design either. There was an ancient repeating ballista that was quite similar (albeit manually cranked) that used a chain for cocking and loading.
In fact the concept has been adapted for use with modern firearms. The 30mm cannon on the AH-64 is chain driven. The Cannon on the Bradley is also a chain-gun.