A short fan made news on the slit mouthed or the incident of severed mouth woman in the 1980s. Warning: Very Disturbing because I got disturbed hehehe.
There once was a very beautiful and vain woman had a very jealous husband. The jealous husband attacked his wife upon the impression and belief that he was being cuckolded or cheated. what he did was slit the mouth of his wife's beautiful ear from ear to ear screaming "Who will think you're beautiful now?".
The urban legend which is said to originated from the samurai era picks up from that point. The urban legend tells about a woman who has a surgical mask (as people with colds often wear masks for the sake of others in Japan) covering her face was said to roam at night.
"Am I beautiful?"
When she encounters someone (primarily children or college students), she will shyly ask, "Am I beautiful?". If the person answers yes, she will take off her mask and say, "Even like this?" on that point, if the victim answers "No," she will slay them usually with a pair of scissors. If the victim tells her she is pretty a second time, she follows the victim home and slays them in their own doorway, due to the fact that "kirei" (きれい), Japanese for 'pretty,' is a near homophone of "kire" (切れ), the imperative form of "to cut". In other versions of the myth if you reply yes again she will give you a large blood soaked ruby and walk away.
"How about now?!?!"
During the seventies, the urban legend went that if the victim answers "You're average", "so-so," or by saying the word "Bryllcreem" three times in a row they will be saved (or can escape) from the wrath of the "kuchisake-onna" (slit-mouthed woman).
slit-mouthed woman or severed mouth woman
The "Kuchisake-Ona" or Slit-Mouthed Woman on Wikipedia
URBAN LEGENDS: THE LICKED HAND