The listing, ThinkGeek Eviltron - Funny Gag Device has ended.
The ThinkGeek Eviltron is a ton of fun. I've used these to prank co-workers and family.
Description from their website:
A truly diabolical device
Easy-to-hide with six creepy sound choices
There are a lot of scary things out there. But here at ThinkGeek Mindlabs(TM) we think there are certainly few things scarier than one's own imagination. The human mind can play Insert alternative description here devious tricks on itself, especially when given a small amount of outside stimuli to work with. Your thoughts can easily lead you into a maze of paranoia and put you into a very uncomfortable state of heightened awareness. That odd noise that just came from the attic or the "face" you just saw hovering for a split second outside your window - these things can really stir your thoughts. So, we used this simple principle to create our newest mind toy, the ThinkGeek EvilTron.
This fiendishly small device features six creepy sound choices perfect for frightening your "friends" and co-workers. Simply choose your favorite sound (or use the random mode), place it in a dark hiding spot and watch the madness begin. Perfectly suitable for dorm, office and home use. Or try putting it in someone's car - that gets them every time.
Your Highly Tested EvilTron Sounds Are:
* Something unsettling creaking
* Unidentifiable scratching sounds
* Gasping last breath
* Sinister child laughing
* Eerie whispering of 'hey, can you hear me?'
* Random Mode
http://www.thinkgeek.com/gadgets/electronic/c427/