I know the week's barely started, but I've already got the freakishly scary weekend project I want to take on. Some folks have put together instructions to build a completely automatic, autonomous sentry gun.
All the instructions, from how to build the firing mechanism to the open source control software, are available on the site below and while the video clip leaves a bit to be desired for lack of an actual gun (water or otherwise), I still think this is one kickass project. I can't wait to build one and duck while it shoots paintballs at anything that moves. [Sentry Gun via Boing Boing]