Antichrist (2009)

I've been meaning to watch more Lars von Trier films ever since I watched and loved Nymphomaniac. But he is not the easiest director to watch, so I kept putting them off until now, as I decided to watch horror movies for 31 days straight and I picked Antichrist. 

The movie tells the story of a couple who has just lost their child. After the funeral, She (Charlotte Gainsbourg) falls into the depression hole and He (Willem Dafoe), a therapist), tries to help her by figuring out what her fear is.  To do this, they head off to their cabin in the woods. Once there, however, her mental state rapidly deteriorates.