Kuchisake Onna is a woman with the mouth sliced.
Long time ago, over 1000 years ago, she was the wife of a samurai who was thinking his beautiful woman was cheating on him. The warrior decided to give her a lesson and to steal her beauty forever, slicing her face from the edge of her lips up to her ears, so that nobody would look at her with admiration, but with fear.
After her death, the woman comes back for revenge. In the foggy(sau misty) nights, she wanders the streets looking for someone to play with.
She seems to be a normal woman, wearing a coat, only that on her face she has a surgical mask and in her hand she has a scissors.
She will ask you "Am I beautiful?" and if your answer is "no", you will end being murdered with the scissors. Not even "yes" is a good answer because she will take off her mask and she will ask you "Am I beautiful now?". The answer "no" will make her cut you in two, but the answer "yes" will make you follow her to her house where she will destroy your face.
The only escape is to tell her "You are not beutiful, but not ugly too, you are so-so." This answer will confuse her.
