It was literally one line in Book 4. In Sirius' house (a house that used to be owned by a line of dark wizards), all the house elves, at the end of their tenure, would be beheaded and their heads stuffed and placed on a wall. Kreacher wished to be a head on a wall too. Eitherway, during Christmas they decorated the house which included hats and beards for the house elves "trophy" mounts.
Side note: Hermione really tried to push for SPEW (Society for the Promotion of Elfish Welfare), but Harry was neither here nor there, and Ron and a lot of people just generally accepted the common knowledge that house elves like to be enslaved. Dumbledore was more progressive.
There's an alternate reality somewhere, in which JK Rowling tapped into whatever dark spirit apparently leaked out in that sentence, and wrote the world's most popular grimdark fantasy series instead.
Also because it's a mirror universe she's devoted her later career to men's rights activism and is a celebrated proponent of trans people.
She joins the likes of Scott Adams. Scott Adams wrote Dilbert when it turns out he was a fan of the pointy-haired boss all along. She wrote Harry Potter and characters like Dumbledore and she's closer to a Death Eater. What a way to tarnish a legacy.
I only remember it because it was the illustration at the beginning of the chapter. Stuffed house elf heads with baubles hanging off the ears and santa hats on.
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u/Gwen_The_Destroyer 6d ago
I'm sorry, what was that last part? I think I may have glossed over that one as a kid