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[[quoteright:350:[[UncannyValley http://static.tvtropes.org/pmwiki/pub/images/Nightmare_Valley.jpg]]]]
[[caption-width-right:350:You're not perfect...]]
Were you surprised at all? I mean, this show is '''terrifying'''.

''WesternAnimation/CourageTheCowardlyDog'' has a ton of freaky stuff in every episode, with some comedy to add a little NightmareRetardant in. However, some episodes tend to avoid the comedy angle, [[NightmareFuel and we end up getting these.]] In fact, these moments are so frightening that you may actually wonder why this show airs on the daily Creator/CartoonNetwork timeline instead of the Creator/AdultSwim timeline, which would actually fit there.

[[folder: The Chicken from Outer Space]]
* The freaking pilot episode was already filled with terrifying scenes such as the Chicken from Outer Space '''snapping the neck''' of one of the farm's chickens (with a bunch of already dead chicken lying around) and Eustace's slow transformation into a chicken (and he's LaughingMad through the entire process).
** Also, when Courage brings Muriel, it was just the chicken and the [[NeverFoundTheBody bodies of the dead chicken]] had all dissappeared. We never find out what the chicken did to them, as Courage frantically looks for them in the hay.
** The transformation is especially terrifying; what with Eustace's [[RedEyesTakeWarning glowing red eyes]] throughout, and constantly losing his clothes all while laughing the whole time. Making this even worse is the UncannyValley that is the pilot's animation, which seems to linger on the transformation every other scene.

[[folder: Katz]]
* Any episode featuring [[CatsAreMean Katz]]. Katz has no qualms about killing Courage or anyone, and he seems to have no traces of comedy whatsoever. His {{Leitmotif}} might be as equally creepy accompanying his appearances.
** "A Night at the Katz Motel" is arguably his worst appearance, as his monstrous schemes at its worst take place in the middle of the night in a rundown motel. This episode is definitely not for arachnophobes.
** He's a SerialKiller and most of his episodes imply the family are only the latest in a long line of victims to fall into his traps...and the only ones to leave.
** He only targeted Muriel in one episode for [[EvilIsPetty the fact that her pies won first ribbon over his]].

[[folder:Le Quack]]
* A subtle one, but Le Quack. At the end of the first episode featuring him, he is arrested by a police officer in a blue uniform and thrown into the back of an armored police truck. Cut to a few seconds later and we see him walking along a desert road alone, wearing the police officer's uniform. The hat, the pants, everything. The truck? On fire beside him. He walks up to the screen and says [[{{Catchphrase}} "They have not seen the last of Le Quack."]] Scary? It happens in another episode. Within seconds of being tossed into the penitentiary, we cut to Le Quack standing outside of it while it's ablaze and he says his catchphrase. Does he even add a little maniacal laughter to take the edge off? No. That was all you needed to know. He's done talking to you now in his [[EvilSoundsDeep creepy voice]].
** However, not all kids were frightened by him; in fact, some people who grew up watching the show say that he was their favorite character.

[[folder: The Queen of the Black Puddle]]
* [[TheVamp The Queen of the Black Puddle]], a creepy water demoness who can appear from ''any'' source of water, seductively hypnotizing Eustace so she can take him back to her underwater castle, where she [[OneWingedAngel turns really hideous]] and [[ToServeMan tries to eat him alive]].

[[folder:Freaky Fred]]
* There are plenty of scary episodes, but [[http://courage.wikia.com/wiki/Freaky_Fred_(episode) "Freaky Fred"]] stands out. He's obviously not right in the head, and he has sharp pointy objects within reach.
** What makes Fred stand out from all the other villains of Courage was that he had no malicious or murderous intent with any of his actions. He was just an insane man with an almost fetish-level obsession with shaving people against their will (incidentally, shaving IS a sexual fetish). Despite his urges ruining his only relationship, his career, and his life in general, he shows no remorse for what he's done, though he knows its wrong. He cant stop himself because its what makes him happy. And the worst part is that he's probably the only Courage villain to "win", in that he succeeds in shaving Courage bald, save for his tail (because that would be ''weird'').
** The choir of children that can be heard singing when Fred starts shaving Courage... *shudder*
*** As a GeniusBonus, it's fairly clear that Freaky Fred is an {{Expy}} of Theatre/SweeneyTodd.
** This episode is also unique in that it is told from the villain's point of view, so the viewer gets a better look inside Fred's mind.
--> '''Freaky Fred''': [[TheFourthWallWillNotProtectYou Hello new friend]], my name is Fred. The words you hear are in my head. I say, I said my name is Fred, and I've been... very naughty...
** NightmareRetardant: some people find "NAUUUUUUUUGHTY" hilarious.
** Eustace spends the entire episode calling Fred a "freak" - [[JerkassHasAPoint and for once, he's absolutely right.]]
** Freaky Fred is essentially [[DoesThisRemindYouOfAnything like a sexual predator or serial killer in everything but action]]. He isn't actually dangerous, thank God, because his compulsion isn't lethal, but there are people like him in the real world, with the same lack of restriction, and THEIR impulses aren't harmless. Fred isn't evil, not in the traditional sense. He isn't Katz, a cruel, sadistic bastard who enjoys tormenting those weaker than him. He isn't Le Quack, a criminal mastermind. He isn't even the Queen of the Black Puddle, a supernatural predator. Freaky Fred is, for all intents and purposes, your friends, your neighbors, your family; and you will never know, because most of them are never caught. They don't want to hurt you, they know it's wrong; but they have to, because it's what their brain tells them to do.
* Fred's flashbacks on his pet hamster and girlfriend being shaved by him also have a very creepy tone to them, mainly due to the [[CreepyChangingPainting sudden changes to angry expressions in their portraits]] and the musical stings.

[[folder:King Ramses]]
* "Retuuuuurn the slaaaab...or suuuffer my cuuuuurse...", or [[http://courage.wikia.com/wiki/King_Ramses King Ramses]] from "King Ramses' Curse". To some, it's not even so much the voice, or his equally creepy {{Leitmotif}}, but the way he moves. The way they animated him makes him look just like an UncannyValley reanimated corpse (not helping matters was that as opposed to the 2D animated characters, he's animated in CGI). And he just stood out in front of their house the whole time, never moving from that spot, but always watching them.
** His voice sounds like someone that shouldn't be anywhere near kids.
** On the other hand, the [[LoudOfWar really bad disco music]] in the second curse could be considered memorable for giving something of a MoodWhiplash to an otherwise terrifying episode. So is "Oh, come on..." and Muriel making food as the locusts approach the farmhouse.
** In the beginning of "King Ramses' Curse", a [[TheSwarm giant black swarm]] chases the thieves who stole the slab. They bury it just in time for the cloud of doom to reach them. The camera pans to the side as they scream, and when it pans back, [[DeaderThanDead there's nothing left of the thieves or their car]].
** How about the ending of the episode? Eustace still refuses to give up the slab, and [[TooDumbToLive tries to extort Ramses]] to return it. The episode ends with a TV interview with an archeoligist saying that the slab has been returned to Ramses tomb, only for the camera to show that ''EUSTACE'' has now been imprisoned with as an image on the slab.
--> '''Eustace''': [[AndIMustScream AAAAAHHHHH!!!!]] [[WhatAnIdiot What's your offer?]]

* The season finale [[http://courage.wikia.com/wiki/Perfect "Perfect"]] ended the series with some particularly chilling moments. Possibly they were saving the scariest for last.
** The elephant in the room here is the [[FanNickname Perfect Trumpet]] [[UncannyValley Thingy]], pictured above. This is probably the scariest thing to ever appear on the show. It's a downright bizarre hallucination of Eustace's broken bugle at the beginning of the episode... except it now sports [[NightmareFace a whispery, eerie human head]] ([[BodyHorror with the bugle's tube going directly through the top of it and out the other end]]).
*** If you thought the picture alone was bad (''that thing just stares into your soul''), it's even better when you see it in motion. There are two reasons behind its "being creepier in motion": the vaguely off-key (or distorted, take your pick) background music, and the way the creature's eyes seem to imply that [[HypocriticalHumor it is somewhat of an incomplete experiment]], waiting for someone to [[DrivenToSuicide put it out]] [[DeathByDespair of its misery]].
*** What's even worse is the fact that it's ''slowly floating towards the camera'' in an ominous aura of white light, and that behind it is an incomprehensible, foggy blue backdrop. Then, after it quietly delivers its line, it creepily looks away from the camera and smiles weakly, all while the whisper "perfect" echoes louder and faster in the background. The sequence itself [[JumpScare begins without warning]], yet it ends so quickly that you'll be asking yourself: "[[BigLippedAlligatorMoment What the hell was that?]]"
*** Some people also interpret this scene as the creature being disappointed, given its forlorn expression and way it looks downwards and away from the camera.
*** Another creepy factor (which extends to the episode as a whole) is the recurring theme of imperfection, [[AdultFear as it is]] - especially counting the "it's your fault"-ish way the line is delivered by the bugle- [[FamilyUnfriendlyAesop likely to induce slight cases of inferiority complex among the more literal-minded viewers.]] It doesn't help much that the way the dream is presented makes it appear as if it's [[TheFourthWallWillNotProtectYou directly addressing the viewer]], rather than Courage.
** The Perfect Trumpet Thingy was only the first in five nightmares Courage had to endure, the other four ranging from being genuinely creepy to [[TearJerker saddening]].
*** The second nightmare was essentially a DownerEnding parody of ''Film/TheWizardOfOz'', with the three main Oz inhabitants --the Tin Man, the Cowardly Lion, and the Scarecrow, all portrayed by Courage-- not getting either of the things they desired --to have a heart, to be brave, and to have a brain, respectively--, while The Wicked Witch of the West (also played by Courage) [[TheBadGuyWins watches them from her crystal ball, cackling at them]].
*** The third nightmare was [[NothingIsScarier a bunch of childish drawings rendered in CG, fluttering around a blue abstract space, while an ominous wind chime plays]].
*** The fourth nightmare (animated in stop-motion) was Courage on stage juggling pies in front of an audience. The audience begins to laugh at him, upon which Courage realizes [[NotWearingPantsDream the bottom half of his body has been shaved]]. In embarrassment, he tries to cover himself, breaking his concentration and causing the pies to fall down and splatter all over him.
*** The fifth and final dream, depicted in a crudely drawn, cut-out cartoon, is Muriel handing Courage a giant vase. Courage accidentally drops it...which causes Muriel to then ''shatter like glass''. Courage utters a anguishing "[[BigNo NO!]]" in horror as the entire dream similarly shatters into nothingness.
** [[SadistTeacher The Perfectionist]]; not only does she torment Courage and give him the aforementioned sequences of nightmares, but when Courage finally accepts himself for who he his, ''she melts''.
*** While this can also be seen as a {{tearjerker}}, things become even creepier when you recall that the Perfectionist only exists '''INSIDE OF COURAGE'S HEAD.''' Every time Courage is called imperfect and every time he is told to complete a task to become perfect, that's all happening ''in his head.'' The ending becomes more heartwarming because of this fact, but the events in the episode are still saddening and disturbing. Poor Courage...

[[folder:Courage in the Big Stinkin' City]]
* There's also a nightmare factory of an episode that is "Courage in the Big Stinkin' City". The whole episode is creepy, but it really cranks it UpToEleven when Courage enters the condemned apartment building to retrieve a package. The first two doors are rather silly, but when he opens the third door, he sees [[http://courage.wikia.com/wiki/The_Violin_Girl a girl playing the violin]], which Courage likes. She soon turns around and goes scary bitch mode on Courage, revealing a freaky demon face and ''screams''!
** It doesn't help that she's animated in a claymation style instead of the normal 2D art. When they decide to change the animation style for a character, they do NOT mess around.
** The FridgeHorror that is the monster behind the door. Complete with skeletons around the room and a "help me" message written on the window. [[NothingIsScarier Even worse,]] ''[[NothingIsScarier we never find out what the monster is]].'' Also, the whole entire reason Schwick sent Courage to get the package with a squeegee inside was only because he needed to remove the "help me" message. Possibly to lure more victims without suspicion.
--> '''Schwick''': You wanna know what made these bones? [[YouDoNotWantToKnow You don't wanna know what made these bones.]]
** The fact that Schwick is a giant cockroach is really nightmare fuel; cockroaches are nasty enough to begin with, and Schwick is [[BigCreepyCrawlies five feet tall]]. His eyes do not help.
** Although probably one of the less frightening 'residents' of the building, there is [[spoiler:King Ghidorah]], who appears suddenly and utters a deafening roar. For {{Kaiju}} buffs, this is often seen as a clever reference, but it was probably startling to many kids who watched the episode when it first aired.

[[folder: The Spirit of the Harvest Moon]]
* "The House Of Discontent" is about as intentionally scary as the above examples. The premise involves an UncannyValley spirit harvest moon with a [[http://farm5.static.flickr.com/4027/4660441418_443e5147d4_m.jpg creepy white human face and dark soulless eyes]] trying to entrap and ''melt'' the Bagge family because Eustace failed to grow a plant to ensure his farmer status. Again, like Ramses, [[http://courage.wikia.com/wiki/The_Spirit_Of_The_Harvest_Moon the Spirit Harvest Moon]]'s {{Leitmotif}} is quite creepy.
** The voice was surprisingly deep and ominous as well, but the real thing that made this terrifying was that this was an eerily-out-of-place live-action black-and-white disembodied head, interacting onscreen with Courage and his owners. The fact that they were shown onscreen at the same time just seemed to add to the guy being convincingly scary, and the different styles were even more dissonant than the UncannyValley-CGI Ramses, who never shared the screen with any other characters.
** How about the fact that the Spirit of the Harvest Moon tries to ''KILL'' Eustace, and by extension Muriel, for not honoring their land properly? Yeah, turns out the the reason the Bagge's property is a wasteland is because Eustace is a selfish, cruel old crank who is too broken to understand the symbiosis of a farmer and his land.

[[folder: Benton Tarantella]]
* The episode "Everyone Wants To Direct". This episode had a dark atmosphere with barely any humor, and the plot involving [[SnuffFilm killing someone in a movie for real]] is all too real. Also, said zombies turned out to be past {{serial killer}}s who managed to slay a dozen people. This is all mentioned ''[[WhatDoYouMeanItsforKids on a kids show]]''.
** At least Benton had his face covered by the goofy fake nose and glasses for most of the episode. His partner, Errol Van Volkheim, on the other hand we see in all of his disturbing, rotting glory. With stringy hair, decayed and sharp teeth, bones poking through his skin, and missing his eyes save for one that looks like it's about ready to pop out of its socket at any second. Oh, and let's not forget that shrieking noise he makes when he first rises from the grave (check it out here: https://www.youtube.com/watch?v=-7A406Dtpcw). Seriously, all that shown on daytime Cartoon Network.
* "Angry Nasty People", especially if you've been the victim of verbal abuse. What's especially scary is that [[HumansAreBastards the general public]] has no problem at all with slinging insults at Muriel and Courage. Then, when it looks like Courage is going to throw a broken Muriel into [[ItMakesSenseInContext a quicksand pit]], there's a shot of viewers ''cheering''.

[[folder:The Great Fusili]]
* ''The Great Fusili''. Specifically [[DownerEnding the ending]]. In it, Courage fails to stop Muriel and Eustace from being turned into puppets. Well, thank God that this show has a NegativeContinuity. However, this was originally going to be the last episode... There's also the nonexistent crowd, Fusili being turned into a puppet as well and the countless victims beforehand. Seriously, Fusili's puppet storage looks like a CannibalLarder...
** Courage reenacts his usual situation with them, implying that he had gone through some serious SanitySlippage by the episodes' end.

[[folder: Dr. Gerbil]]
* ''[[EarWorm It's Doc Gerbil's World, It's Doc Gerbil's World...]]''' For those who don't know, in the episode "Human Habitrail", Courage ends up in the horrible cosmetics-themed version of "It's a Small World". [[YouHaveBeenWarned And it is creepy.]]
** Doctor Gerbil himself is probably one of the most frightening characters to ever appear on the show. Masquerading as a kindly vacuum salesman and SouthernGentleman, he's really a deranged scientist who kidnaps his customers and performs all kinds of sick experiments on them to test out his products (which leads to all kinds of BodyHorror). Let's also not forget the horrifying EvilLaugh he lets out whenever he experiments.
** How about the implication that he thinks he's being GOOD? He thinks that kidnapping humans and subjecting them to horrible experiments is payback for humans doing the same to animals, nevermind that the humans he's doing this to has no involvement in animal research and never did. And then there's the crazy woman he's driven insane and [[BodyHorror given suction-cup feet to...]]
** The [[https://www.youtube.com/watch?v=vOKYwnpe57A boat chase down the river]] has an eerie feel to it, namely because [[NothingIsScarier there's no sound but the haunting wailing of an opera singer and Courage's few screams of fright.]]

[[folder:Demon in the Mattress]]
* In the episode "The Demon in the Mattress", Muriel gets a new mattress that's...not quite right. Later that night, she gets [[DemonicPossession possessed]] by it, and turns into a green-skinned FieryRedhead with a [[VoiceOfTheLegion horrifying voice]].
** Plus, when the two rats are delivering the haunted mattress, the mattress gets a NightmareFace for a split-second along with an EvilLaugh.
** Whatever Eustace was going to do to Muriel after the demon left Muriel and possessed him.
** There was NightmareRetardant, though: "It'd be lovely if I could have a cup of...[[CatScare TEA!]]" and "[[WhoWritesThisCrap Kick 'em in the dishpan, hoo hoo hoo?]]"

[[folder:Ball of Revenge]]
* The episode "Ball of Revenge." It features six of the most terrifying villains in the show, united under a common goal: ''completely annihilating Courage''. But the worst part? Eustace was the one who brought them together. Now he isn't just an annoyance and a jerk, he is a true antagonist to Courage. Even dedicated viewers likely didn't expect him to go this far in his hatred. [[EvilIsPetty And it was all for a freaking blanket!]]
** Freaky Fred's short cameo at the end, notably his first appearance in the show since his introduction, counts as well. All the villains have been defeated, Eustace is punished, and everything seems to be going well- until Courage turns on the TV and Fred appears, calling Courage's name with his razor at the ready. ''[[FridgeHorror Fred is still out there]], [[NothingIsScarier and he's not done with Courage...]]''

[[folder: Stitch Sisters]]
* In "The Quilt Club", Muriel wants to become a part of a quilt club run by ConjoinedTwins, so she works herself into a HeroicRROD by knitting a football field-sized quilt. Turns out becoming part of the club means that you are ''[[AndIMustScream sewn into the club's special quilt for all eternity]]'', and the twins start to do that to Muriel. Muriel is [[StepfordSmiler smiling the entire time]]. Luckily, Courage saves her in time.
** Watching Muriel attempt to impress the Stitch Sisters (and, unwittingly, the quilt) is both this and a {{Tear Jerker}}, as all she wanted was to be a part of the club. It basically looks like the Sisters are [[DoesThisRemindYouOfAnything brainwashing Muriel into a cult]].
-->'''First Sister:''' How badly do you want to belong?
-->'''Muriel:''' (frazzled and desperate) Uh huh, uh huh, uh huh!
-->'''Second Sister:''' More than you belong with Eustace?
-->'''Muriel:''' [[WhamLine Who?]]
** Doesn't just look like - this is ''exactly'' how cults operate in reality.
*** 1) Make the club / group look important to join to your victim.
*** 2) Alienate the victim from their loved ones in favor of your cult.
*** 3) Physically separate said victim from everything except the cult.
*** 4) Constantly reinforce the cult's mantra until they're fully brainwashed. ("Weave, Believe, Belong!")
** The quilt lets out a demonic BigNo at the end.
** To top it all off, the twins are sewn into a tissue that Eustace [[NauseaFuel blows his nose into]]. {{Squick}}!

[[folder: The Fog of Courage]]
* If you thought the show was already creepy in 2D, try picturing it entirely in CGI. First of all, the antagonist of the episode is a Fog spirit who descends upon the Bagge Farm just because Eustace won't return the necklace that belonged to the Fog's lover. The Fog spirit definitely came from the Uncanny Valley, It has a giant face with bulging eyes and misplaced teeth and all it ever says is chanting the name of his lost love ''Cariaaaanaaaa, Cariaaaaaaanaaaaa'', and it's even creepier when it sprouts ARMS and starts walking with them. By far, the creepiest scene in the episode is where the Fog goes into a rage when Eustace refuses to return the necklace unless the Fog makes him an offer. Upon hearing this, the Fog becomes so angry that it opens its GIANT MOUTH, makes a hissing sound and creates an impending storm that completely surrounds Eustace and Courage.

[[folder: Other]]
* The scene in the episode "Courage the Fly" where Eustace is chasing Courage as a fly. At one point, he gets Muriel's face stuck with fly paper and physically ''tears it off'', revealing her skeletal face! When he puts it back, ''he puts her face back upside down''. Thank god for cartoon physics.
* The episode with the [[OurWerebeastsAreDifferent Weremole]], especially when it [[JumpScare suddenly bites]] Muriel, eventually causing her to {{transform|ation horror}} into another one.
* Some of [[http://www.youtube.com/watch?v=kusyDPg-wGY Courage's screams]] can be very terrifying for younger viewers, especially when [[WildTake some body parts are deformed or organs come outside]]. Watch it, if you dare. By far the scariest is the scream from "Car Broke, Phone Yes" (the fourth clip in the video), where Courage utters an unholy banshee-esque high-pitched screech.
** Another one of his most grotesque screams is one from "Courageous Cure", where, upon seeing the two aliens for the firs time, all his organs suddenly explode out of his body.
** In that same episode, when Courage sees Eustace and Muriel being experimented on by the two aliens, as he screams he sticks out his tongue, and various, smaller tongues are seen popping out of it.
** "Night of the Scarecrow" has one scene where Courage literally ''screams'' his heart out of his mouth upon seeing an alien about to attack the farm.
* "Cabaret Courage". Getting dropped into [[WombLevel a room which looks like (is?) the inside of a human body]], talking to a guy that ''looks like'' an ulcer, then performing for that guy, getting dropped into some kind of green digestive-acid if you fail...
* "The Mask", which features a girl in a flowing white dress wearing a giant creepy doll mask (and a terrible, raspy voice) who beats the shit out of Courage due to a hatred of dogs and spies on them to look for any sign of hypocrisy. The back story about her friend's [[DomesticAbuser abuse]] by a pack of dogs is a (not even thinly veiled) depiction of domestic abuse and forced prostitution. ''Courage The Cowardly Dog'', a children's cartoon series with an episode revolving around [[DarkerAndEdgier an inner-city gangland drama]].
* "Curtain of Cruelty" is definitely scary. The town turning from kind into rude and hateful. To make things worse, Muriel is dragged off for not being ''mean'', and is forced to undergo re-education, where she is forced to watch a video of dolls being broken by a fist, and eventually told to [[IfYoureSoEvilEatThisKitten smash a hamster with a mallet]]. Thankfully, she resists the brainwashing. Then at the end of the episode, the gerbil is now smiling, only for it to turn out that Eustace is now being put through re-education to be [[GoodIsNotNice GOOD]] by the voice and the hamster, who hits him with a mallet as the screen turns black.
* Eustace being consumed by foot fungus in "The Clutching Foot". Especially the way it's presented. Eustace decides to take a nap to get rid of his foot fungus rather than going to the doctor like a sensible person (granted Dr. Vindaloo is explicitly a quack, so maybe avoiding him is a sensible action), and wakes up the next day feeling refreshed and healthy... [[SurpriseCreepy then he]] [[OhCrap glances downwards]]...
* The Evil Vet from the episode "Remembrance of Courage Past". At least Katz in some episodes, had reason to try commit atrocities, but the vet [[ForTheEvulz just seems to enjoy being evil]]. He's the one who not only directly traumatized Courage as a child, but was also responsible for [[ParentalAbandonment the disappearance of his parents]] and Courage ending up as an orphan until Muriel rescued him. Any villain from the cartoon pales in comparison to the evil vet.
* The episode 'Bad Hair Day' has a sequence where Courage goes into a building that farms humans for hair, and he sees dozens of humans hanging from rope on the ceiling... Most of whom have their eyes closed and are not moving, though they probably arent dead, as human hair stops growing after death, aside from a minor post-mortem burst.
* In "The Tower of Dr. Zalost", the titular doctor (who has, at this point, forcefully [[HatePlague made all of Nowhere depressed]]) chokes Courage onscreen. Later, after Courage creates an antidote for Zalost's cannon balls and destroys the fortress, a scorched, seething Zalost chases Courage back into the house, forcing Courage and a newly cured Muriel to hide in the kitchen. [[spoiler: Thankfully, Zalost [[TookALevelInKindness gets better]] immediately afterward.]]
* Though all of these can be NightmareRetardant, due to a popular theory, Courage has paranoia, massive fear of everything, doggy instinct to protect his family and possible psychotic neurosis and/or schizophrenia and everything happening in the show may all be just in his head. [[note]]One example is in the episode "Watch the Birdies" when Muriel was kidnapped by giant vultures. When Courage goes to save her, it turned out she was just babysitting the chicks. Muriel likely just went to a normal human neighbour to babysit, but Courage sees everything as monstrous. And being incredibly sheltered may be the reason why he doesn't take notice of any other houses in the neighbourhood... it wouldn't be totally out there for real-life dogs to not take much notice of homes that aren't theirs, if any notice at all.[[/note]]
* While not as iconic as a lot of scares and villains on the show (heck, the antagonists were just [[WellIntentionedExtremist Well Intentioned Extremists]]), the episode ''Courageous Cure'' is outright disturbing in its handling of body horror and InvoluntaryShapeshifting.
** Not to mention the [[ScareChord unnerving low piano music]] that plays not only in the episode's title card, but through nearly the entire ''episode''
* "Mondo Magic" features a handsome-looking magician named Mondo, who reveals himself to be a hideous reptilian monster, and forces Muriel to [[AndNowYouMustMarryMe become his bride]] by turning her into another one of his kind.
* [[BalloonBelly The]] [[DinnerDeformation end]] of "Dome of Doom". NauseaFuel doesn't even begin to describe it.
* The commercial promoting ''The Magic Tree of Nowhere'' only featured Eustace sharpening an axe, laughing maniacally, and occasionally cut to Courage cowering in the corner, giving the viewer the impression that he was preparing to murder his dog with an axe.
** The titular tree is animated with SynchroVox, which makes it really UncannyValley, but it's quickly offset by the tree's kind and compassionate nature.
* The episode "The Transplant", where Eustace [[TransformationTrauma turns into a giant kangaroo monster]]. Although the climax of that episode, where Courage decides to become a monster as well and he fights Eustace in Paris, is a CrowningMomentOfAwesome and reminiscent of ''VideoGame/PrimalRage''.