I Will Survive: 14 Must-Know Lessons From Watching Scary Movies

This British shocker about a group of women who go spelunking — that is, exploring caves — features encounters with a batch of humanoid beasties, but that isn't what's most terrifying about it. What's memorably unsettling is the movie's icy claustrophobia: It's a nightmare of damp rocky crawl spaces you would never want to be wedged into.