Ghost Stories
I saw this earlier in the year; it is a hidden gem, no one talks about it.
At the start, it seems like a straightforward tale about a character (played by Andy Nyman) investigating hauntings; he talks to three people about their experiences.
The plotline just gets creepier and creepier, mostly thanks to a few good jumpscares thrown in, and you don't really know what it all means.
The last half hour or so blew me away; it was weird, and scary, and took the film in directions that I hadn't seen coming. Also, Martin Freeman proves that, after The World's End he can still play creepy quite well.
I would recommend giving this film a try if you haven't done so yet.
Day 13: Underrated Horror Movie
Day 14: Favorite Horror Movie Musical
Day 15: Favorite Horror Movie Slasher
Day 16: Favorite Horror Movie Hero
Day 17: Favorite Horror Movie Heroine
Day 18: Favorite Horror Movie Love Pairing
Day 19: Favorite Horror Splatter Porn
Day 20: Favorite Horror Movie Location
Day 21: Favorite Animated Horror Movie
Day 22: Favorite Horror TV Series
Day 23: Favorite Horror that comes from a Book
Day 24: Best Horror Movie You Saw Last Year
Day 25: Favorite Classic Horror Movie
Day 26: Favorite Horror Movie Series
Day 27: Least Favorite Horror Movie
Day 28: Favorite Horror Movie Made for Kids
Day 29: Favorite Jump Scare
Day 30: Favorite Plot Twist
Day 31: Favorite Horror Movie