What the hell can I do to combat this ennui and boredom at work?

I typically like to spend time unplugging my boss's monitors, stealing co worker'ss food, saying incredibly rude things about their children/spouses/weight, throwing general office supplies at them, I've even so much as sunk to the low of stalking them into the bathroom, waiting for an unsuspecting coworker to drop trow in a stall, and start tossing wet paper towels at them while making awesome animal noises. Well, I'm running out of things to do, and honestly, need a hobby here at work that's more work appropriate...aside from yahoo answers...so, any ideas? (And I work in a security camera company, so keep in mind, I'm videotaped pretty much anywhere I go) no Nudity, no religious themes, and no outright punishable-by-law violence...but you know, everything's negotiable.