In old Scotland, the Kelpie is a treacherous water devil
who lurks in lakes and rivers. It usually assumes the shape
of a young horse. When a tired traveler stops by a lake
to rest or to have a drink, he would see a horse, apparently
peacefully grazing. When he mounts the horse, the Kelpie
dives into the water, but besides wet clothes, the rider
gets away unharmed.