Beavis and Butt-head (1994)
Season 4, Episode 12
"Late Night with Butt-head"
Mike Judge's seminal creation: Beavis and Butt-head; a show embraced by the very demographic Judge was mocking, the show was inescapable in the 90s, as were irritating impressions of the title characters (both voiced by Judge). Judge would go on to create the TV series King of the Hill, and the movies Idiocracy, and Extract, as well as his masterpiece (so-far) Office Space.
Context: Beavis and Butt-head, the two adolescent slackers, are enjoying their favourite activity, criticizing music videos, when Donny Osmond's Sacred Emotion comes on. Beavis and Butt-head are apparently aware of the Osmonds' religious affiliation... sort-of.
Exegesis: This clip is so juvenile (as was intended), it would be even more reductive than usual to pursue anything more than a cursory exegesis.
It's that old canard again: "Mormon" kind of sounds like "Moron", if you're an idiot. This joke is more or less identical to the one used in the "Married With Children" clip. Butt-head does correct his friend's malapropism (although he has just suggested that Donny's dad, "Lee Harvey Osmond", killed JFK), and points out that Beavis means "Mormon". How to describe Mormons to someone as simple as Beavis? Butt-head: "Those are those dudes who come up to your house on bicycles." Unphased, Beavis asks if the music he's hearing is the Moron Tabernacle Choir...
So we've got "Moron" for "Mormon", missionaries on bikes, the Tabernacle Choir... the only easy Mormon reference not mined for laughs in this clip is polygyny, and I'm not sure how that oversight was made.
With all that said, Donny Osmond (and his family) were real ambassadors for this Church in the 70s. There wasn't anyone as famous at that time who was a faithful member of the Church, let alone someone who was idolized by a lot of young people. (Not all young people, obviously.) To this day, their Mormonism tends to be mentioned whenever any of them are interviewed. In fact it may be the one salient detail most people know about them, along with the fact that Donny has a sister named Marie.