The Legend of the Northern Lights says that if you stay out past dark, the Spirits, or Northern Lights who are playing soccer, will come down and take you and use your head for a ball.
Other Alaska Native variations of the story are spirits of dead ancestors playing soccer with a walrus, or the other way around, walrus spirits playing with a human head.
The legend has changed over time. Depending on the area the story seems to be different. My best guess is that it was misinterpreted when people from other villages came over.