Don't let the fact that it's subtitled throw you. It is hilarious, well-made, and so very, very wrong. I don't want to spoil anything, but there *might* be a scene where hordes of naked old Santa-ish men chase screaming children through the woods of Finland. Because Christmas!
You're welcome.

ETA: The movie was based off a humorous short film, which you can view here on Youtube. The movie takes this concept and goes even better places.