This Day in Halloween: Norwegian horror film "The Troll Hunter" premieres as the Sundance Film Festival in 2011. / Illustration by Victoria Diaz.
Trollhunter premieres as the Sundance Film Festival in 2011. The Norwegian fantasy horror mockumentary even includes a cleverly edited clip of Norwegian Prime minister Jens Stoltenberg admitting to the existence of trolls. It opens in limited release in the U.S. to mostly positive reviews.