It’s probably against some arcane telecommunications law, but I want one anyway:
from Wired:
TV-B-Gone, a new universal remote that turns off almost any television. The device, which looks like an automobile remote, has just one button. When activated, it spends over a minute flashing out 209 different codes to turn off televisions, the most popular brands first.
. .. Altman said people who hear about TV-B-Gone start thinking about other nuisances. Friends have asked for ways to jam cell phones, shut down vehicle subwoofers and kill car alarms.