I'm going to go back, really far back:
Nosferatu
Yes, one of the oldest films I've seen - it looks a bit weird with all its stop-motion animation and budget special effects, but you have to admit, it's good. The stop-motion makes its antagonist more creepy for me.
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