History NightmareFuel / OnceUponATime

* Regina's... [[KillEmAll little plan to get Henry back in 2x20]] and the fact that she honestly doesn't understand that this is a bad thing. And then she wipes Henry's memory.

* Consider the fact that Pixie flowers grow as a counteracting measure when a great evil is present. When Regina was the BigBad in charge of Storybrooke (specifically 18 years before the Dark Curse was broken) a single flower grew to counteract her evil (and at the time she had been in charge for 10 years and done many horrible deeds). How bad is the Black Fairy? All she has to do is ''exist'' in Storybrooke and the snowy forest '''[[UpToEleven grows a giant field of the things.]]'''

** What's also unnerving is just how ''quickly'' Regina becomes [[{{Yandere}} fixated]] on Owen. The thought of a stranger who is clearly mentally unbalanced taking a sudden interest in your child is the epitome of AdultFear. It's even scarier when you're stuck in a small town where the person is incredibly powerful. When Regina first called Kurt, asking to see his son, he probably wanted to refuse but accepted because he was afraid of angering her.

** Everything regarding Pan is pure AdultFear. As much as younger viewers will appreciate how creepy the Shadow is, it's the adults who'll best acknowledge just how utterly sinister the idea is, the thought of waking one morning to find your child has vanished, never to return. Even worse, the Shadow isn't Pan's sole method of taking children. He's also the show's version of The Pied Piper, and has been seen to draw potential Lost Boys to him with the music from his magic flute.

* Zelena goes to check on Baby Robin - and finds her missing from her crib and ''in the arms of Black'', who is infamous for stealing children. AdultFear at its finest.

* Gothel has already turned herself into a walking example of AdultFear, between her willingness to [[MurderByInaction kill her own infant daughter]] and how often she manipulates children to betray their own parents, such as what she did to Drizella. Who else did she target? ''Robin.''

* Nick really establishes himself as this when he ''kidnaps Henry and holds him captive in his apartment''. Who is his next target? ''Zelena.''

* Really, Owen and Kurt's experiences throughout ''Welcome to Storybrooke'' could just as easily belong in a horror movie. They're out camping in the woods when there's a huge and terrifying storm; the next day they come across a town that appears normal at first glance, but there's something subtly wrong with it. The lady that they befriend ''seems'' nice at first, but it gradually emerges that she might be controlling everyone in the town somehow, and she's growing more and more insistent about them staying with her. ''Permanently.'' Then, when they refuse, she tries to hold them prisoner; what's more, Kurt sees her talking to a ''glowing, bloody heart'' that seems to affect her henchman in some way. Scared yet? When they try to escape she chases after them with the sheriff; Kurt sacrifices himself to buy more time so that Owen can get away - and when he comes back with the authorities, there's no trace of the town, ''or'' his father. It's like something out of ''Series/{{Supernatural}}'' or ''Series/TheTwilightZone''.

* To show Emma that Henry is losing his mind trying to convince her by stealing the book, Fiona ''throws him down the stairs'' with magic, landing him in the hospital. WouldHurtAChild indeed. Even worse when we realize that this is the first time a villain has ever physically injured Henry. She came very close to averting his InfantImmortality.

* From the fourth season: [[Disney/{{Frozen}} Marshmallow]] is back. He's a dozen times more terrifying than in Frozen, and just as readily ticked off.

* The Snow Queen casting a freezing curse on all of Arendelle. It's even more terrifying than [[Disney/{{Frozen}} Elsa's eternal winter]]. Elsa made a lot of snow, the Snow Queen ''freezes everyone and everything''.

** Props need to go the visual effects department: this Hades is obviously based on the Disney version of ''{{Disney/Hercules}}'', so he's a snarky guy with flaming blue hair. It could have been silly in live action. ''It isn't.''