History NightmareFuel / PrettyLittleLiars

* Just the whole idea of being stalked and terrorized by someone who knows your every secret. And it could be ''anyone'' you know, like [[spoiler: your best friend]].

* The dolls in 'If These Dolls Could Talk', especially the creepy [[spoiler: Alison]] display. "Follow me. End up like me." And the scene ends with the doll repeating "End up like me" like a broken record.

* After [[spoiler:Mona]] was revealed as the first A and institutionalized, the girls thought it was over and they could get on with their lives ... only for the A messages to start again. This was the first time it dawned on them that A isn't just one person. It also adds some serious ParanoiaFuel: Even if the new A is caught, how can they be sure that it's now truly over? They made that mistake the first time...
* Although we are never given a full sight of it (apart from some blood spotted smeared on the wall) [[spoiler: Mona's]] death looked to be brutal with it even stated that there was blood everywhere. [[spoiler: Showing her body at the end of the episode, pale and wide-eyed did nothing to calm the chills.]]
** We later learn that [[spoiler:Mona was drugged, paralysed and conscious the entire time, hence her corpse-like appearance when she's in the trunk of the car. As she puts it: "I wanted to scream, but I couldn't. It was like living a nightmare you can't wake up from."]]

* "You have 30 seconds to leave that room." [[spoiler:From A, as he stands over Sara Harvey with a knife over video-link]].
* Aria being BoundAndGagged in a crate in season 3's HalloweenEpisode, [[spoiler: along with Garrett's lifeless body literally inches away from her face]]. On top of that, she was about 30 seconds away from being thrown out of the back of the train, but the other Liars conveniently arrived in time to rescue her.
* In "If These Dolls Could Talk", there is plenty of this to go around. [[spoiler: Creepy doll hospital? Check. Creepy Chucky like voice leading the girls to an absolutely terrifying doll simulation of Alison's death, complete with a yellow shirt, blood, dirt and shovel? Check.]]

* When Emily's slight overdose of her mother's painkillers in ''Turn of the Shoe'' causes her to slam head first into the wall of the pool during a swim meet. She remains face-down in the pool with blood pouring out of head until one of her teammates pull her out. What makes this spookier is the fact that we are shown a P.O.V. shot of her vision turning blurry and dizzy prior to her slamming into the wall, complete with steady drum beats and the swooshing sound of the wall approaching.
* How Alison was murdered. She was attacked from behind so hard that she knocked out. Then, [[spoiler: she felt being buried '''alive''']] and couldn't do anything to save herself. [[spoiler: Alison manages to crawl out of her grave and survives, but is still terrified of someone that is tormenting and trying to kill her.]]

* When Emily's slight overdose of her mother's painkillers in ''Turn of the Shoe'' causes her to slam head first into the wall of the pool during a swim meet. She remains face-down in the pool with blood pouring out of head until one of her teammates pull her out. What makes this spookier is the fact that we are shown a P.O.V. shot of her vision turning blurry and dizzy prior to her slamming into the wall, complete with steady drum beats and the swooshing sound of the wall approaching.

* When Emily's slight overdose of her mother's painkillers in ''Turn of the Shoe'', causes her to slam head first into the wall of the pool during a swim meet. She remains face-down in the pool with blood pouring out of head until one of her teammates pull her out. What makes this spookier is the fact that we are shown a P.O.V. shot of her vision turning blurry and dizzy prior to her slamming into the wall, complete with steady drum beats and the swooshing sound of the wall approaching.

* Aria's torture in "This is A Dark Ride"

* Aria being BoundAndGagged in a crate in season 3's HalloweenEpisode, [[spoiler: along with Garrett's lifeless body literally inches away from her face]]. On top of that, she was about 30 seconds away from being thrown out of the back of the train, but the other Liars conveniently arrived in time to rescue her.

* The dolls in 'If Dolls Could Talk', especially the creepy [[spoiler: Alison]] display. "Follow me. End up like me." And the scene ends with the doll repeating "End up like me" like a broken record.
* All the snippets we see of -A's lair, culminating in TheReveal in 'UnmAsked'.

* "You have 30 seconds to leave that room." [[spoiler:From A, as he stands over Sara Harvey with a knife over video-link]].

* "You have 30 seconds to leave that room." [[spoiler:From A, as he stands over Sara Harding with a knife over video-link]].

* The Dollhouse.

* Although we are never given a full sight of it (apart from some blood spotted smeared on the wall) [[spoiler: Mona's]] death looked to be brutal with it even stated that there was blood everywhere. [[spoiler: Showing her body at the end of the episode, pale and wide-eyed did nothing to calm the chills.]]

* Although we are never given a full sight of it (apart from some blood spotted smeared on the wall) [[spoiler: Mona's]] death looked to be brutal with it even stated that there was blood everywhere. [spoiler: Showing her body at the end of the episode, pale and wide-eyed did nothing to calm the chills.]]

* Alison's general behavior; if she sees you as useful, she'll do anything to keep you by her side, including exploiting your love for her.