- In a movie focused upon bringing dead animals back to life, Weird Girl is seriously the creepiest thing in the film, especially with those eyes that make up 90% of her head.
- Edgar and the crazed expression on his face throughout most of the movie could also count.
- Then there's Mr. Whiskers' transformation, as we get to experience every part of it; from his limbs and neck unnaturally extending, to wings graphically breaking out of his back, and all through it the sounds of his bones cracking and his yowls of pain. No way that isn't a kiddie version of The Fly, with a little bit of An American Werewolf in London thrown in.
- The Disney logo itself can be scary if you weren't expecting the Logo Joke to happen.
- Victor had to watch his beloved dog die right in front of him.
- It's not hard to imagine what Sparky looked like at the scene of the car accident...
- Adding in the moment where Mr. Whiskers pulls a Not Quite Dead moment and drags Sparky back into the burning windmill, make that TWICE.
- The thought that a young boy dug up a grave. It was his pet's grave, but still...
- Though most of them are assholes to Mr. Rzykruski in getting him fired, imagine being one of the people in town square when the children's monsters attack. You have no idea what the hell you're looking at, and in the midst of these gremlin-like sea monkeys there's a kaiju turtle roaming the place. Who wouldn't be freaked out?
- The Were Rat's introduction in the form of a goddamn Jump Scare
- Hilariously subverted with the resurrection of Colossus. Dark music plays and Nassor calls to his beloved pet to rise from his tomb. Then we see that Colossus is a normal hamster and it becomes a deliberate example of Nightmare Retardant.
Nightmare Fuel / Frankenweenie