Some Context: A group of children are being terrorized by a shapeshifting monster who lives off their fear. Beverly — one of these children — has just finished beating her abusive father unconscious in the family bathroom, only to turn around and be IMMEDIATELY faced with the psycho clown prince of "Hey, no thanks," Pennywise.
Why It's Nightmare-Inducing: Oooh, I know what you're thinking, "Why would you say something so controversial, yet so brave?" with regards to putting a recent film this high on the list. WELL, if you saw this one in theaters, you'll remember how every single person jumped right out of their skin on this part. Also, you know, clowns.