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Nightmare Fuel: Teen Wolf
For the 1985 movie:
For the TV series:
In the opening of the fourth episode, we have a scene of The Big Bad Wolf running alongside a car, nearly out of sight. Creepy.
Invoked in-universe when Derek asks Stiles to cut off his arm.
The video store scene.
Oooh yeah, a nice bit of Fanservice with shirtless Jackson...wait...is that...Oh God Why is there a BLACK CLAWED HAND COMING OUT OF HIS MOUTH???
Gerard cutting the Omega in half and leaving the other half of his body dangling from a tree. His spine is quite visible.
The Alpha had no qualms about disabling Stiles's car by dismantling the battery and throwing it into the school as a taunt. And then texting Allison under the guise of Scott so that she (and, by association, Jackson and Lydia) would come to the school. And then 'warning' the cops that any calls from the high school would be pranks. Yeah, sweet dreams.
Let's just say all of the "Night School" episode.
The doctor's check-up scene for Jackson. Try watching it without cringing or grabbing the back of your neck.
The Alpha revealing his fangs to Lydia. Sweet GOD.
The hunters torturing the principal.
Allison and Scott's Kanima encounter in Season 2 episode 2.
Jackson opening up a snake aquarium and allowing the snake to slither down his throat and later come out of his eye.
The scene at the night club when the Kanima attacks, and the guys just start falling down one by one.
The library scene. Holy. Shit.
Allison's mom in general.
The scene where Matt nearly drowns. Made even more disturbing when his dying thoughts are flashbacks of him drowning.
Season 3 introduces us to the alpha werewolf pack. Two of which can FUSE together. It also features a a deer slamming into Alison's and Lydia's car as well as a swarm of crows bursting into a classroom.
The glimpse of Erica's body in the vault. Especially the way that her head just pitches forward when Allison turns to look at it.
In Fireflies, the titualar fireflies. Which happen to be giant and kidnap a girl, who is later found murdered.
The method of murder used on Heather and the other victims. Nothing called "The Threefold Death" can sound pleasant.
Cora Hale's wolf form is positively terrifying. While most werewolves on the show look more or less human (and fairly silly) when wolfed out, she looks completely monstrous and more than a little like a lot of the scarier vampires from Buffy.
Nearly everything from "Motel California".
The motel keeps a tally of every guest suicide. While nobody is looking, it goes up by three.
Each room has a bible containing newspaper clippings of each suicide committed there.
Boyd hallucinates his dead little sister everywhere, and nearly kills himself by submerging himself in a tub and placing a safe on top so nobody can stop him.
Ethan imagines being split in two and having his brother emerge from him, and tries to bisect himself with a handsaw.
Isaac relives a fight with his father before being trapped inside the freezer. Again.
Scott douses himself in gasoline and tries to kill himself, saying that whenever he tries to help he only makes things worse.
Just the fact that everyone else's hallucinations are enough to push them over the Despair Event Horizon, but Isaac is so used to being abused that he just lays there and accepts it.
Plus, Lydia keeps hearing reenactments of the suicides happening all over the motel, including a young couple's suicide pact and a woman drowning herself and her baby.
When we find out why Deucalion is blind. Gerad stabs out his eyes. With flash-bang arrows.
The 'true form' of the Darach. The close-ups of the mauled faced and shredded flesh are terrifying. A true Squick moment happens when Jennifer kisses Sheriff Stilinsky and then pulls away as the lip less Darach. Even worse when you remember that Derek sleep with Jennifer
The town hosts a concert in memorial for the victims of the serial killer, whom the audience knows is the Darach. During the orchestra, the band starts playing what the audience, and one of the characters, recognizes as the music which plays when the Darach is about to attack. Meanwhile, the band looks possessed. It ends with a death trap in the piano killing the elderly music teacher. Even more disturbing in that the Darach is holding a knife to Lydia's throat and counting down the activation of the death trap to the second.
The scene with Isaac's father. He initially comes across as okay if a little intense but when he asks about Isaac's grades, he see the fear flash across Isaac's face when he has to say he is failing a subject. Mr Lahey starts throwing plates around and telling Isaac to clean it up and then throws glass at his face and nearly blinds him, all the while never raising his voice above a soft sadistic tone that shows how much he enjoys terrorising his son. The look of absolute terror lets us know that this has been going on for a very long time. The worst part? There is nothing supernatural or mystical about it. Isaac's dad was just a vile sadistic monster who managed to be the most despicable and horrifying person on a show filled with supernatural creatures.
The scene where Isaac's father is ripped apart and eaten by the Kanima. He completely deserved it and much more but it doesn't make the way he gradually realizes what a horrible situation he's found himself in any less chilling.
The sneak peeks for the season 3b include Stiles freaking out while a person tries to escape from a white screen and his classmates appear possessed. Playing in the background is a creepy child-like voice and the last lines we hear are Stiles saying "Wake up!" while the child sings "Life is but a dream"