The Legend of Ygg (2009)

A group of girl riders drive one another to extremes. Under the influence of a riding instructor, the girls develop a bizarre riding game. Inspired by an old Norse legend, they use the horse to test their courage. The goal is to become fearless. Dressed in black, they go riding in the dead of night. By using the traffic road as a ritual arena, the girls cause mysterious car accidents in the Norwegian countryside.