Here is a neat little invention that basically is just a white box with a series of LED lights that simulates a real TV. Apparently it looks like the real thing from outside. The device can be all yours for $40.
FakeTV Burglar Deterrent Device [thinkgeek.com]
Great idea! So simple and brilliant, if you think so too please go to http://www.ratemyideas.com/story.php?title=FakeTV_Burglar_Deterrent_Device-1
and vote hot or not!