i find japanese folklore awesome! the stories are so unique and i love hearing about em, my favorite one is the "slit-mouthed woman" yokai, a spirit with not so defined origin, with many interpretations. however, her behaviour is interesting, she usually walks around covering her mouth either with a mask or a scarf, and asks you if you think she is pretty, if you say "yes" she will reveal her huge slit mouth and ask "how about now?" if you still say "yes" she will slit your mouth to be just like hers, but if you say no she will kill you with her scissors.
a neat thing about this legend is that there are ways to escape it! like by saying you are busy going somewhere, trying to confuse her or just taking off and running!
i love these stories!