The whole film has a lot of intense parts.
The antagonist, Seymour Parrish, displays invasive behavior towards the middle-class family that would regularly show up at SavMart and has an intense obsession with them throughout the movie. He keeps an extensive collection of pictures of them.
Thematic elements create a disturbing tone for the film. In particular, Sy is a lonely man who forms an unhealthy obsession with a family whose photos he develops.
The distorted dream sequence where Sy bleeds out of his eyes is particularly scary and comes out of nowhere.