DESCRIPTION:
News reports on the 'broadcast signal intrusion', or pirate signal hijack, of WGN-TV and WTTW Channel 11 in Chicago on November 22, 1987 during the Chicago Bears game, and broadcast of the Doctor Who episode 'Horror of Fang Rock'. The hijacker was dressed as 1980's fictional character Max Headroom.

back when broadcast was really all there was, and the internet was but a glimmer in ARPANET's eye ..

https://en.wikipedia.org/wiki/Max_Headroom_broadcast_signal_intrusion
http://motherboard.vice.com/read/headroom-hacker