Gifu

Kuchisake-onna, the slit-mouthed woman

A woman in a surgical mask stops a passer-by and asks: am I beautiful? Say yes and she takes the mask off, revealing a mouth slit to the ears, and asks again. The legend erupted in the spring of 1979 in Gifu Prefecture and crossed the whole of Japan within months: schools sent children home in groups, police stepped up patrols, newspapers reported the panic. The roots are older, going back to the Edo period, but the 1979 version was the country's first case of an urban legend requiring a police response.