Picture it: Hannington! Saturday November 26 1977! 5.10pm! ITN's early evening news is flashing around the living room via the now defunct Southern Television, and all of a sudden, there's a loud click and the audio changes. What you hear is not the voice of the newsreader currently occupying the magic rectangle, nor the sound of the cartoon that followed. What you hear through the static is a creepy message, apparently from space, warning the entire human race that it had a short amount of time to disarm, live in peace, or suffer consequences. After several minutes, the message disappears just as quickly as it appeared. No explanation, just an audible click as the rogue transmitter was turned off.
Presented here is the sound of entire message as transmitted (no video is known to exist) plus several pieces of audio surrounding the events; the newscaster's announcement from the end of the cartoon that followed what he calls the "breakthrough in sound", the audio from the final ITN newscast of that day, and that evening's midnight radio newscast from Independent Radio News, with comment from the Independent Broadcasting Authority (Britain's FCC).
Nobody ever owned up to doing it, and no charges were ever brought.
"All your weapons of evil must be destroyed. You have only a short time to live to learn to live together in peace. You must live in peace... or leave the galaxy."
It's not easy to hear through crappy speakers, you might want to put in a set of headphones and concentrate hard.
Several newspaper accounts of the incident.