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[[OverlyNarrowSuperlative For a show about a serial murderer]], there's a lot of nightmarish stuff on ''Series/{{Dexter}}''.

* Every time Dexter has a flashback to his mother's murder. To whit, the sight of a two year old child drenched in blood, with the alternating sound of his mother begging her killer not to do it in front of her son and her telling Dexter not to watch, which then segues into the sound of Dexter crying mixed with his mother's screaming ''as she is cut to pieces with a chainsaw''. No wonder Dexter is so messed up.
* Any of the times Dexter talks to his about-to-be-dead victim has slight indications of this, but when Dexter finally finds the man who killed his mom, [[ChainsawGood well...]]
* The Trinity Killer:
** A ''batshit insane'' killer who "kills in threes": a death in the bathtub, a death made out to look like a suicide (by falling), and a bludgeoning. The key here is that the said falling kill has him say that if his victim doesn't do it, he will go back to her (it's always a woman, mother of two) house and ''kill off her relatives one by one''. Then the bludgeoning. In the one we see in the show, he claims that "'''you''' made me ''do this''" in a rather sad tone. And the bathtub one shows him '''[[FanDisservice naked]]'''.
** His very first appearance consists of him physically overpowering a small woman in a manner that is very reminiscent of sexual assault ([[FanDisservice both of them being naked]]), and then sticking a razor blade between her legs in the tub.
** There's his absolutely chilling forcing of a woman to jump to her death, with her ''begging him to push her because she's too scared''.
** His incredibly brutal beating of a man to death with a hammer.
** It turns out his cycle actually has four murders, and the first one is unspeakably horrible. [[spoiler:[[AndIMustScream He buries unconscious ten year-old boys in concrete]]]].
** Lithgow's ability to go from a cold authoritarian monster, to a [[PsychopathicManchild psychotic man child]] crying over his own crimes to [[spoiler:a God-respecting family man]] is perhaps more frightening than his crimes themselves.
** How [[spoiler:Arthur Mitchell's sister died: slipping in the shower, which shattered the doors, which led to her cutting her femoral artery on the glass and bleeding out. ''Oww oww FRICKING OWW!'']]
*** Made even creepier by how it happens; she catches him peeping on her, and, naturally, freaks out, causing the accident.
%% The Season 4 finale.
* The Barrel Girl Gang made [=DVDs=] of them torturing and raping their victims. Mercifully, virtually nothing is shown but the screams definitely qualify as this. Lumen's is especially horrific.
* [[spoiler: Mike getting shot and killed]] in the Season 7 premiere. Consider this: if you were driving at night and saw a man in a nice suit standing by his broken down modest-income car, struggling to change the tire, wouldn't you stop to help him?
* What Travis Marshall does to ''his own sister'', not just killing her, but ''[[VillainousIncest stripping her naked]] [[IncestSubtext and posing her as the Whore of Babylon]]''. That's...not right...
* Episode 6x04 was particularly jarring for this troper. Imagine being the girl in the greenhouse, knowing the trap that's set up for her demise as the police walk right into it. Even worse, [[SurvivorGuilt imagine being one of the cops who triggered the device]].
* Comparing to the rest of the list, maybe minor, but still: the husband of first Trinity bathtub victim. Imagine that you come back to see your spouse murdered, then you're tried and sentenced for killing her, and then you're accused of another homicide done in similar fashion. Pretty horrifying.
* Season 8's "Scar Tissue". It's not the scene of [[spoiler:Deb crashing the car she and Dexter are in into a lake to purposefully kill them both, only for her to be saved by a fisherman, and for her to swim back and save her brother]], no, it's the ''sound of a muted harp glissando'' when [[spoiler:they rise from the water in the final second]] that conjures dark images to mind. It's not the only example of the show's musical score frightening the crap out of its audience, but even headier scenes like Season 6's finale didn't have scores this commanding.