Woodland Critter Christmas was a pretty good one.
The bumper for the ad break:
Singers: What special time and what special day, it's woodland critter Christmas!
Squirelly: (Pops out of a hole) Hail Satan!
Narrator: High up in the forest on a dark, craggy peak,
the horrid mountain lion and preyed on the weak.
For the critters to be saved, someone had to stop that nasty old cat...
Stan: Goddamnit, this is ****ing ridiculous!
Narrator: Said the little boy in the red poofball hat.
Rabbity: Yay! Sacrifice me to the Devil!
Narrator: He ran out the living room, turned out the light,
and went back to the forest to set everything right!
(Stan just sits down and watches TV)
Narrator: ... and went back to the forest to set everything right!
He tried to forget all about it by watching TV
but his conscience caught up with him and to the forest he did flee.
... He thought he could hide from his problems - not true!
He knew in his heart the thing he had to do!
Stan: Leave me alone!
Narrator: He knew that only by going to the forest could he-
Stan: All right all right all right! God!
Narrator: Where can they learn that?" the boy said with a frown.
"I know! The abortion clinic just outside of town."
Stan: What?!
Narrator: So he picked up the cubs and down the mountain he stormed.
And took them to where abortions are performed.
Stan: No, he didn't.
Narrator: Yes he did.
Stan: No, he didn't!
Narrator: Yes he did.
Stan: No, he didn't!!
Narrator: Yes he (Stan suddenly appears in the abortion clinic) did!
Stan: Aw, Goddamnit!
Part of the Christmas song in the episode:
It's once a year, it's Christmastime!
And it happens once a year.
It's once a year, it's Christmastime!
When we hear about how Christmas only comes
Once a year.
And the ending, which makes it even clearer that Cartman is telling the story:
Narrator: And they all lived happily ever after. Except for Kyle, who died of AIDS two weeks later.
Kyle: (Offscreen) Goddamnit Cartman!
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Everyone is different. No two people are not on fire.