The C category in the Folktale Motif Index stands for Taboo: Things that heroes in stories are not allowed, or not supposed, to do (for example "C50 - Offending the gods"), and also things that happen to people when they do the things they shouldn't. Case in point:
C961.5. Transformation to anthill for breaking tabu
I found this weird little moment in a folktale from the Thadou people in India, titled The Magic Fiddle. It is part of a longer tale than involves seven pregnant women, a blind king, a horned owl, some goat blood, and yes, a magic fiddle.
|Thadou dresses are apparently|
very beautiful, by the way
(Photo from Wiki Commons)
But. You will not believe what happens next!
Madly in love with the youngest daughter of God, the boy snatches her petticoat off the rack, and runs away with it. Noticing that a stranger just made off with her underwear, the girl yells after him: "Hey! You! I had diarrhea last night and my petticoat is soiled!" The boy immediately stops in slight panic to look at the garment - and turns into an anthill.
The story goes on for several more pages - notably, the second time he steals the petticoat, the girl tries the same trick, but it doesn't work, and they have to get married. Still, good for her for the first time. That was some pretty quick thinking.
(Find the full story here.)
C152.2. Tabu: refusing unreasonable demand of pregnant woman
C165. Tabu: marriage with person whose blood one has drunk
C181.4. Tabu: women not to climb on roof
C227.1. Why cannibalism is out of vogue
C281. Tabu: drinking without presence of dead heads
C461. Tabu: bearded man laughing when shaken
C568.1. Tabu: poets to be ignorant of national literature
C662. One must eat "death vegetable" whenever one sees it
C942.1. Loss of magic strength by smoking
C948.3. Tongue of woman who breaks tabu protrudes and entwines itself around a post in the home