The original Annoy-a-tron from Think Geek was one of the most clever, fiendish and frustrating prank devices you could ever legally unleash on your fellow co-workers. This evil little gizmo was designed to be hidden somewhere where it could never be found and emit random annoying beeps in 2-8 minute intervals. Not only would it drive people absolutely crazy trying to find the source of the beeping, it probably caused many to simply give up and quit their jobs.

Good News, Think Geek has just released the Annoy-a-tron 2.0 ($13)! This new version looks like the original, but now features 6 all new sound choices, along with a volume control knob. Simply select one of the new annoying sounds which include a beep, a 12 kHz electronic noise sound, 15 kHz mosquito tone, a cricket, a doorbell or set it to alternate between all the sounds. Now hide this little non-descript electronic device somewhere where it will never be found and hopefully annoy the most people. Then, quietly laugh to yourself as people frantically search their office trying to discover where the sound is coming from. The Mosquito Tone could be the most fun sound of all if you want to drive teens and younger people nuts. It's not audible to most adults! Can you hear it?

This is not only a great office prank, it would be funny to hide this in classrooms, stores, church, cars and just about anywhere else you want to drive people insane. I'll definitely be picking up a few of these. (via Michael Kiely)