My friend told me this story.
There was the woman in the edo period of Japan, her husband was having an affair with her and slit her mouth wide open to the ears. So now her ghost lurks around dorms of colleges(sp?) wearing a mask to hide her face. She sees a kid and asks "Watashi wa kire" in english means I'm pretty? If the student says yes, she'll take off the mask and ask the same question, if the kid says yes again, the kid will be killed. If the person said average, or so so, their life will be spared.