Beetlejuice/Nightmare Fuel

The Movie

 * Two Words: Betelgeuse Snake. It even got referenced in the Shin Megami Tensei series of games, as a boss enemy in Shin Megami Tensei 2.
 * The fly screaming "Help me, help me!" while he ate it in the toy village.
 * Made even worse if you recall that Geena Davis starred in the remake of The Fly two years earlier.
 * When the Maitlands are being exorcised, and begin to rapidly age before everyone's eyes.
 * The scene where Barbara tries to scare Delia by hanging herself in a closet and then ripping off her own face.
 * Fortunately for Delia and Otho, they can't see her. They were more terrified at how small the closet was.
 * I'm surprised no mention was made of Barbara and Adam's transformations where Barbara stretched her face with her eyeballs in her mouth and Adam made his face beak-shaped with eyeballs on his fingers. Look, if you dare.
 * Given the theme of ghosts resembling their corpses at the moment of death..just stop and think of some of the horrible ways that people have died.
 * Shrunken head guy, guy RUN OVER BY A CAR AND REDUCED TO A REALISTIC PANCAKE, and a guy who SET HIMSELF ON FIRE FROM SMOKING AND WAS ALL CHARRED UP AND SHRUNKEN...
 * The Sandworms.
 * Betelgeuse himself qualifies as Nightmare Fuel...and not just when he's in his giant-snake form. He's pretty much Chaotic Neutral incarnate, can change form at will into pretty much anything, and he's not above killing people.