[NSFW] The Spice Channel was a softcore pornography cable TV offering in the 1990s. If you didn't pay for a subscription, you could still see scrambled video, which elevated the original video into psychedelic deep dream abstract art experiments. Here are a few clips.
From the YouTube description:
Signal bleed, or scrambling was a filter used by TV providers to partially block premium channels. This loophole was used as a form of advertisement. In 2000, United States v. Playboy Entertainment Group "required that cable television operators completely scramble or block channels that are "primarily dedicated to sexually-oriented programming" from 10 pm to 6 am."