The Doktor Howl Children's Hour:
The 1970s were sort of the golden age of childrens television. You had the Banana Splits, HR Puffenstuff, and all manner of other brain damaged things spewing forth from the acid-damaged minds of TV producers that had come of age in the 60s. But by far the worst programming was the "variety show" format, and the worst example of THAT was the Doktor Howl Children's Hour.
The format of the show was standard; six minutes of patter, nine minutes (severely edited to fit) of something badly animated from the lower end of the Hanna-Barbera stable, four minutes of back-and-forth between Doktor Howl and his dreadful Ventriloquist dummy "Nigel", six minutes of commercials scattered about, and five minutes of closing dialogue.
About half way through the first season, things started to go a little sideways. The closing dialogue didn't seem to be scripted at this point, instead Doktor Howl would make a comment about what scientists were up to in those days, and then "Nigel" would rip him a new one for 4 minutes.
Compounding this was the fact that there was no background music, just the "sound" of an empty set, and the two of them talking (granted, the only music that could have done it justice was Tom Waits or maybe Tom Petty on his crazier days). There was no studio audience by mid-season, for reasons that will become obvious shortly.
Anyway, when talking to people who remember the show, the last 5 minutes inspired comments like "I felt like I was watching footage from Dachau" and "It was like watching your little sister torture a gerbil to death", and "It hurt me as a child. I hated it. It was like watching a bad car accident in slow motion".
The Nigel doll didn't actually start swearing until the third season, by which time Doktor Howl looked physically and mentally drained. There was no question of there being a 4th season, and in fact the Nigel doll taunted Doktor Howl with the claim that he would die during the final episode, right on national television.
Doktor Howl was almost fired multiple times, but after each "closed-door" meeting - to which he brought his Nigel doll - the show was allowed to continue.
Doktor Howl, obviously, became quite a sensation, especially after he apparently somehow altered the Nigel doll so that its eyes would glow red during the "5 minute hate", as the end of the show was nicknamed. Howl was interviewed about the doll's behavior on a couple of occasions. The first time he was asked, he just stared at the camera with a fixed smile and sweated, refusing to speak. The second time, he went into hysterics about how "...that THING, that fucking THING...it's POSSESSED! HELP ME!". The interview was never aired on television, obviously, but word got around.
The last episode was never aired. Doktor Howl was pronounced dead on the scene at the studio, of a massive coronary brought on by extremely elevated stress levels.
The Nigel doll was never seen again.