The Simpsons: Ice Cream of Margie (With the Light Blue Hair)
(S18E07) I usually take on the role of apologist when it comes to The Simpsons, defending it against those who say it's not as good as it was in the early years. I still maintain the series is the funniest and smartest thing on network television, but even I can admit when an episode isn't quite up to snuff, and this one was nowhere near snuff, up to it or otherwise.
I'm enough of a fan of the show that even a mediocre episode still has enough to entertain me, and there were a few moments in this episode I thought were pretty funny, such as the dead ice cream man being buried with a giant ice cream scoop, or Homer taking Polaroids of himself to show Marge how sad he was that he wrecked her popsicle stick sculptures, but the basic plot had been done before (Homer upsets Marge by not taking enough of an interest in her and finally redeems himself in the end) and it's been done better.
I don't, however, think that once a certain aspect of the character's lives has been dealt with the show should never return to it again. Marge is much less selfish than Homer, and that dynamic has plenty of comedic possibilities and it's worth revisiting when a substantive story can be constructed from it, but this episode just felt kind of light to me.