I was blown away by this one. Truly terrifying even (or especially) in its daytime scenes. It's really deeply unnerving at times. Basically, it takes what has become a cliche: the killer always standing behind or stalking the oblivious victim and made it amazingly frightening again. This film doesn't treat its audience like a bunch of idiots either. It could've spelled out certain things like who that old lady is but it's quite clear if you pay attention and I think letting your viewers figure that out on their own makes it much more effective. We've gotten some phenomenal horror films the last few years, and mostly, they're all indie although James Wan did very well with The Conjuring (I liked Insidious too), but if you haven't taken the plunge yet on It Follows, don't miss out a minute longer. Acting, FX, cinematography, etc. are all top notch.