The beautiful terror of Ehime.
A hari-onago is a Japanese ghoul, an apparition of beauty on the island of Shikoku. She stalks about at night, seeking young men to feed upon. When she finds a suitable victim, she laughs, her power enticing him to join in. If he succumbs and laughs with her, she lashes out with her long, barbed hair. Her victims quickly find themselves brutally mutilated in the tangles of her black locks.
Few stories tell of men escaping her laughter, but quick and nimble feet and a nearby door to shut on her might just save you from doom.
Also check out this cool flash fiction from a previous A-to-Z: H is for Harionago, by Kaye Draper