The ThinkGeek Annoy-A-Tron for $9.99, Annoy-A-Tron 2.0 for $12.99

The Original ThinkGeek Annoy-a-tron would be useless against an army of Snowbots, but it's very effective at disturbing that guy in the sales department or your "friend" down the hall. With its thin design and embedded magnet for easy hiding, the Annoy-a-tron can be placed in a variety of locations. Select one of the three sound choices (2 kHz, 12 kHz, or alternating) and push the switch to the on position. Place it in a proper hiding spot and let the "fun" begin.