A broadcast interruption or intrusion is basically the act of hacking into a radio or TV station and hijacking it with a message. It may seem like a funny prank but can actually be pretty eerie. Well, here are five times a tv or radio station was interrupted with strange messages, including a believed message from an intergalactic alien to a phone-in from a supposed Area 51 worker who caused the radio stations signal to mysteriously cut off.
and check this out.