Many folks celebrate Halloween by watching horror films. The problem is that truly dedicated horror fans started watching them on the first of October and have been doing this for years, so you end up watching the same blockbusters and classics every Halloween. The good news is that the world is full of great horror films you haven't seen already. The bad news is that you've never heard of them. But that what the internet is for.
Redditor CanApprehensive8720 consulted the folks at r/movies for a recommendation of a horror film to impress her boyfriend, who has seen "almost every single horror movie in existence." Movie fans were glad to oblige, and told of extremely niche horror films that thrilled them. Many are foreign films, some are arthouse or student movies, and some are just films that are plenty scary but never got properly distributed or promoted. Some are fairly recent while others go back decades. The post got more than a thousand comments, and CanApprehensive8720's boyfriend was impressed indeed and thrilled to start on a list of new horror films to watch. You can check out the responses in the original reddit thread or read the top twenty movies from it with a trailer to accompany each description at Cracked.
I point people at this film all the time.