Build a terrifying, albeit miniature, arsenal to defend your small space with Mini Weapons of Mass Destruction ($13 each). This series of books includes detailed instructions for building tiny weapons that fit perfectly on your desk or in your cubicle, all made with commonly-found office supplies and household items. While calling them weapons of mass destruction may be a bit hyperbolic, they'll certainly provide plenty of entertainment on a shrunken scale. Each book contains more than 30 weapons, ranging from trebuchets and catapults to blowguns and crossbows. Also included are strategic guidelines, clear diagrams, and safety tips (you could put an eye out with that).