ThinkGeek :: TV Poltergeist Phantom Prank Device
On. Off. On. Off. On. What is wrong with the TV? Only you will know it's the TV Poltergeist! Annoy the crap out of friends and enemies by possessing their TV so it turns on and off at random intervals every 5-20 minutes, 24 hours a day, for weeks on end.
erfect for interrupting lame sporting events, obnoxious video games, moronic sitcoms, and poorly written movies! Using the TV Poltergeist couldn't be any simpler. Hide the TV Poltergeist somewhere in the same room as a TV and turn it on. Aim the LED toward the victim's television. Sit back, keep a straight face and enjoy the chaos.
http://www.thinkgeek.com/gadgets/electronic/d794/