Mind Molestor - For the Price of a D-Cell, You Can Piss People Off

The name alone is spectacular enough for anyone to love, but what exactly does it do to piss people off? Simple. Emits a loud, obnoxious beeping noise every 3 minutes until shut off. Due to it's size consisting of a 9V battery and some very small circuitry, it's easy to hide and will make everyone hate you. Probably the next best thing to beer.

Review of "Mind Molester" revenge device [BoingBoing]