Here is the infamous fight on Fridays between Andy Kaufman and Jack Burns. For some reason, I incorrectly remembered Michael Richards involved in the melee, but although he was a co-conspirator of this hoax, he merely participates. (Supposedly, Melanie Chartoff and Maryedith Burrell - and most of the cast and crew - were not in on the gag).
Interesting thing about Fridays - it aired at 11:30 PM on ABC. But in Philadelphia, it was pre-empted by a movie - and usually didn't start until 1:30 or 2:00 AM. That means it was around 3:00 AM in the morning when I originally saw this broadcast - very surreal at the time.
Also - notice how early '80s audiences reacted to drug references. There was a time when it was very hip and cool to joke about marijuana on television. That would all quickly change during the Reagan years.