Every year there's a film that surpasses all understanding and goes to bizarre and hard-to-understand and hard-to-watch places; this is the one for this year.
A woman leaves her husband for another man. The thing is, her husband hires someone to follow her, and to his surprise, the man she left him for is now already been left also. An unpleasant surprise awaits all those who enter this unsatisfied woman's house, because what's inside is truly disgusting.
One of those films they call "art house," it takes its time, and at first, it might seem like we're watching a family melodrama with lots of shouting, but as time goes on, we begin to realize why it's called Possession (or similar), and while it's not exactly a demon here, I think it would have been better than what actually happens.
A film for those who like stories that take their time and don't mind the strange.