The annoy-a-tron is a little device that makes a small beep every X minutes. If you hide it well enough in a co-worker's cube, it will drive him/her insane and will do almost anything to find it. The annoy-a-tron is currently out of stock at ThinkGeek and I really wanted to prank someone at the office…
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Homemade Annoy-a-thing (Annoy-a-tron) : 4 Steps (with Pictures