I think that when a long-running show gets really bad -- not just mediocre, but really, really bad -- it sometimes becomes more interesting to watch than when it was just mediocre. That's because a show that has totally lost it and has no chance of being renewed for another season will sometimes do the most bizarre things, knowing that nobody's watching and nobody cares anyway.
That's what I was thinking when I saw an episode from the awesomely bad final season of Laverne and Shirley without Shirley (and for the most part without Lenny). Apart from being unbelievably depressing, since you're watching a show that literally has no reason to exist now that even its title is a lie, the writing and acting were about as bad as they could be. (Carmine: "I don't think you know the difference between right and wrong." Squiggy: "Sure we do. It's left and wrong that get me confused.")
But the good side of that is this: only a show that was completely destroyed, ravaged and wrecked would have thought to do this scene: Laverne has been mistaken for a murderer and sentenced to Death Row, a priest comes to guide her on that last mile, and he starts singing. And then the prison doors fly open and a gospel singing group comes out and leads everybody in a song and dance number. And Anne Ramsey is in the scene, as is Laraine Newman in a blonde wig. (The producers tried to compensate for Shirley's absence by having a different "funny lady" as a guest star every week.) The only thing that's missing is that the Ernie Banks who plays the priest is not the Hall of Fame shortstop.
Mind you, I don't think this scene is good. It's just nuts. There's no setup for it; this isn't a "musical episode." It's like they had nothing to do for three minutes so they decided to see if there were some singers available. And they sure didn't spend much time on the choreography. (At one point you can even hear Laverne's voice singing on the playback when Laverne's mouth isn't moving.) But it's endearingly crazy. Most shows today would be off the air before they got this ridiculous. That's only partly a good thing.