hijack

At 5:10 PM on 26 November 1977 the Southern Television broadcast was hijacked through the Hannington transmitter of the Independent Broadcasting Authority in the United Kingdom. The transmission itself claimed to be from an extraterrestrial being. The broadcast took over the sound only, leaving the video signal unaltered. The IBA stated that to carry out the hoax would take "a considerable amount of technical know-how".

(complete text here) (friend-ship)