Once upon a time...

In 2023, I read a bunch of folktale collections, one of which was François-Marie Luzel's Contes populaires de Basse-Bretagne ("Popular Tales of Lower Brittany"), which is 1200+ pages split into 3 volumes (you can find it on Wikisource), which contains the folktale that has the BEST but also MOST BAFFLING ending to a folktale I've ever read.

Pipi Menou et les Femmes volantes ("Pipi Menou and the flying Women" -- no I do not know why it is capitalised like that) was told by Marie Tual, on Ouessant, in march 1873 and ends with

La princesse se fit baptiser, car elle n’était pas chrétienne, puis Pipi l’épousa, et ils vécurent heureux ensemble, et eurent plusieurs enfants. Mais, on dit que ces enfants leur furent tous enlevés par les Morgans.

Translation by yours truly:

The princess was baptised, since she was not Christian, then Pipi married her, and they lived hapilly together, and had several children. But, it is said that their children were all stolen from them by the mermaids[1].

[1] Morgan is the Breton word for mermaid -- the plural is morganed.

Yes, that is IT. That's how it ends. Surprise mermaid! Surprise kidnappings! Surprise mermaid kidnappings! Sleep well, children :)