[[quoteright:265:[[Manga/SoulEater http://static.tvtropes.org/pmwiki/pub/images/trope.jpg]]]]
[[caption-width-right:264:[[DevilInPlainSight Maybe it's because she's a snake?]]]]

->''"[[Myth/CelticMythology Cuchulainn]] has FOURTEEN FINGERS AND FOURTEEN TOES''\\
-->-- '''[[http://bettermyths.com/cuchulainn-is-the-megatron-of-killing-people/ Cuchulainn is a megatron of killing people,]]''' Bettermyths.com

A character's pupils are [[AnimalEyes slitted like a cat's or snake's]], or rectangular like a sheep's or goat's, to indicate that they're channeling something nasty (or that they ''are'' nasty, period). Often with a [[RedEyesTakeWarning red]] or [[SupernaturalGoldEyes yellow]] eye color to accentuate the wrongness. Also eyes have such unusual designs that they seem wrong in the worst way.

Curiously, nobody ever seems to notice this if the character isn't a known antagonist. It's a RedRightHand to identify trouble to the audience.

Sometimes this is the GlowingEyesOfDoom with the dimmer switch turned down.

A subtrope of TechnicolorEyes and UhOhEyes. May overlap with AnimalEyes, generally when the eyes of animals associated with evil and sister motives, or those of animals with strange or unusual eye shapes, are used. Not to be confused with [[IThoughtItMeant evil schoolchildren]].

Compare FireballEyeballs.

%%Do not remove the folders, they are the standard.


[[folder:Anime & Manga]]
* Sumire from ''Manga/VenusVersusVirus'' has cross-shaped pupils along with RedEyesTakeWarning while in her Berserker state.
* Xellos the Priest of ''LightNovel/{{Slayers}}'' has these, along with purple eyes. Naturally, they serve as a RedRightHand to his true nature as a Monster, and he only shows them when he's being serious
* Ryuga from Beyblade metal fusion
* Used by Evangeline A.K. [=McDowell=] of ''Manga/MahouSenseiNegima'' whenever she taps into her vampiric powers: the pupils slit, the sclera turns black and the iris starts to glow yellow. Interestingly enough she only does this AFTER she relinquishes her antagonistic role, for such purposes as [[RightBehindMe scaring the shit out of Anya]] for the lulz.
* Used by certain of the Aoyama girls in ''Manga/LoveHina'', typically right before doing something violent/evil. Happens somewhere around Chapter 70. Naru also gets a pair in Volume 8 on Parakelse Island.
* ''Manga/FullmetalAlchemist'':
** Many of the [[ArtificialHuman Homunculi]] have these. In fact, you can note the contrast between human eyes and homunculus eyes in [[Anime/FullmetalAlchemist the 2003 anime version]] when [[spoiler:Envy feeds Wrath incomplete Philosopher Stones]].
*** It's not immediately obvious, because Ling usually has his eyes closed, [[spoiler:but there is a noticeable difference between Ling's normal pupils when he's in control and his homunculus pupils when Greed is in control.]]
** Kimblee, who is human but a complete psycho has creepy, reptilian eyes.
** King Bradley [[spoiler:a.k.a. Wrath]] has his [[spoiler:Ouroboros mark]] on his left eye, covered by an [[EyepatchOfPower eyepatch]].
* ''Manga/{{Bleach}}'':
** Ichigo Kurosaki does this whenever his [[SuperpoweredEvilSide inner Hollow]] is about to take over, changing the color of his irises to yellow, and the color of his eyeballs to black, with a half mask to boot. Later in the series, [[spoiler: he gains the ability to [[TookALevelInBadass Hollowfy]] at will, making the aforementioned changes to his eyes and assuming the full mask, altering his voice as well]].
** Ulquiorra Cifer's pupils are slitted. When he [[spoiler:activates his second sword release and transforms, the sclera of his eyes change from white to dark green and his green irises become yellow. In this form]], his pupils are still slitted.
** Yhwach, ArcVillain of the final arc, gains two extra pupils in each eye when using [[CombatClairvoyance The Almighty]].
* ''Manga/FairyTail'':
** Gajeel Redfox has slitted red eyes, like those of a lizard or dragon. Makes sense, since he's the [[ExtraOreDinary Iron Dragon Slayer]], was raised by a dragon, and is easily the most feral of the seven Dragon Slayers shown so far.
** The Raijinshuu: Evergreen's and Bickslow's [[GlowingEyesOfDoom eyes glow]] underneath their PowerLimiter, whereas Fried's sclera turn black with a glowing purple pupil.
** Rogue has eyes identical to Gajeel's, though he is a calm if not somewhat overconfident person who gracefully accepts defeat and the idea that he may have overestimated himself, and shows kindness and consideration to others without even having to have Natsu beat the idea into him. The only design purpose they seem to serve is to make him look more like Gajeel.
* ''Anime/{{Noir}}'':
** Kirika's eyes become blank and soulless slits when her "other" personality awakens. In this case, her partner Mireille very clearly notices that something is wrong, making her more attentive that most people in animeland.
** Chloe has similar, if only slightly softer eyes all the time, indicating how she is far more deeply and closely indoctrinated to her role as Noir, than either Kirika or Mireille.
%%* Prince Lotor from ''Anime/{{Voltron}}''.
%%* Nehellenia from ''Manga/SailorMoon''.
* The half-yoma fighters in ''Anime/{{Claymore}}'' have eyes that are normally silver -- these turn into [[SupernaturalGoldEyes gold eyes]] with slitted pupils once they start to tap into their yoma power.
* If someone's eyes do this in ''VisualNovel/HigurashiWhenTheyCry'', they're in big, big trouble. [[spoiler:It means that whoever in that scene has ''normal'' eyes is hallucinating, and is about to go AxCrazy.]] If someone's eyes ''[[MindControlEyes lack]]'' pupils, that's a sure sign of craziness or emotional brokeness.
* Tyranno Hassleberry/Kenzan from ''Anime/YuGiOhGX'' gets HellishPupils whenever accessing the power of his "Dinosaur DNA" that he gained from a bone transplant from an accident at a fossil dig.
** Then when Judai enters Haou mode or becomes Haou Judai, his eyes turn an evil yellow. After [[spoiler:fusing with Yubel,]] they then turn green and yellow, same as [[spoiler:hers.]]
* This is also one of the defining traits of the [[Anime/YuGiOh5Ds Dark Signers]] -- they have very small pupils as well as black sclera.
* Around half the characters in ''Anime/MobileSuitGundamSEED'', and almost any other show involving otherwise {{Badass Normal}}s with some form of berserker ability.
* Vinegar Doppio from ''Manga/JoJosBizarreAdventure'' gains nightmarish black pupils with smaller black dots around them whenever [[spoiler: his [[SplitPersonality Diavolo persona]] takes over or influences his body.]]
* Ayano, in ''LightNovel/KazeNoStigma''.
* Several different characters in ''Manga/GetBackers'' begin to reveal that they carry [[spoiler:Stigma, their pupils forming a cross, which indicate that've surpassed mortal restrictions]] towards the end of the manga. Generally, characters use special contact lenses to hide this trait. When they remove the lens, however, even running away is generally not going to do much good. Other characters don't bother to hide it at all. Taken to its extreme by [[spoiler:the Voodoo King, who has ''three'' eyes and has Stigma in ''all three of them.'']]
* Train Heartnet from ''Manga/BlackCat'' sports a cat's slit eyes, although it seems to highlight his feline features more than it makes him evil. When the slits become especially pronounced, however, bad things start to happen. He manages to scare an entire squad of bodyguards into submission just by walking past them with these eyes.
* ''Manga/{{Naruto}}'':
** Whenever Naruto begins using the Nine Tailed Fox's power, his eyes turn red and his pupils become slits. [[TruthInTelevision Real foxes actually do have eyes like this]] except they are orange, yellow, or brown instead of red.
** Orochimaru has yellow eyes with slitted pupils to further the [[AnimalEyes snake]] motif.
** When Gaara's demonic side comes out, his eyes turn yellow, with pupils shaped along with the sand that envelops his body.
** The [[MagicalEye Sharingan eyes]], which are possessed by Sasuke, Itachi, Kakashi, and various other characters, and when activated are red and have three extra comma-shaped pupils surrounding the center.
** Naruto again, when he completes the Sage mode, accompanied by "froggy" eyes with rectangular pupils.
*** Additionally: at one point, he uses both sage mode and fox chakra at once, and ''both kinds'' [[http://i.neoseeker.com/mgv/459892/892/30/fox_sage_mode_display.jpg overlap with each other.]]
** The series has plenty of these, with the Rinnegan, Orochimaru's eyes... actually, most of the Akatsuki seems to have strange eyes.
* ''Manga/FruitsBasket'':
** Kyo is possessed by the Cat spirit of the Zodiac; thus, when he's angry or otherwise extremely emotional, his eyes become yellow and slitted. Played almost always for comedy in the anime, but the manga uses it half the time for dramatic effect.
** In the manga, Yuki has a similar effect; on occasion, he's displayed something like the Rat's eyes, where his eyes lighten and his pupils disappear altogether.
** On the other hand, Hatsuharu, when he goes [[SplitPersonality Black]] [[SuperpoweredEvilSide Haru]], goes from [[http://24.media.tumblr.com/tumblr_m34n57fyCY1qd3zeko1_500.jpg this]] to [[http://www.freewebs.com/pita_pyon/Black%20Haru.jpg this.]] Akito has done this too. Basically, if Natsuki Takaya draws someone's pupils clearly defined, then something's going down...
* Only sort of an example (as the character is ''clearly'' not human), but Ryuk from ''Manga/DeathNote'' has red pupils. (Another shinigami, Rem, has the classic gold-eyes-slit-pupils.) A clearer example is any character who makes the [[DeadlyUpgrade shinigami eyes trade]], who have demonic red pupils.
* Another not-really-human example: Arcueid from ''VisualNovel/{{Tsukihime}}''. Whenever she gets [[UnstoppableRage really, really angry]], her HypnoticEyes turn [[SupernaturalGoldEyes Gold]] and slitted, at which point only the strongest of characters can fight back, or even move.
* The Blade Children in ''Manga/{{Spiral}}'' all have slit pupils (and [[YouGottaHaveBlueHair crazy hair colours]]). They don't seem to actually exist, as the characters constantly talk about how the only way to identify one is their missing ''rib''.
** This is kind of weird, actually. With the five primary Blade Children, the boys always have the slit-pupils, while the girls only have them when they're feeling something very strongly. The anime uses this to good effect in one episode focusing on Sayoko Shiranagatani, a Blade Child who has amnesia and is being targeted by a Hunter. The camera constantly focuses on her eyes when she's in danger, and her pupils never go down to slits the way Rio's or Ryoko's would, emphasizing the point that she's escaped the Blade Children's fate.
*** Or the fact that she's completely deadpan and emotionless in that episode. Anyway, the above only works with the anime; in the manga, Blade Children's pupils go weird when they're feeling murderous - either actually fighting or just being threatening. (It makes the threatening very effective.) That also stands for the boys and is particularly striking in Kanone's case, as his eyes go from large and kind-looking to just freaky.
** And then Hizumi's eyes are just crazy all the time. (It's in fact sort of related.)
* Alucard of ''Manga/{{Hellsing}}'' manifests slitted, cat-like pupils when using his HypnoticEyes in the manga. Recent chapters have shown Integra Hellsing's eyes like this in some panels, though whether this is a side-effect of keeping a fully powered Alucard under control or just a sign of being extremely pissed off is not addressed.
* ''Anime/TengenToppaGurrenLagann'':
** Nia's cross-pupiled green-and-pink eyes are pretty freaky when you first see them, but still [[{{Moe}} extremely cute]]. [[spoiler: Until she gets {{More Than Mind Control}}led by the bad guys, her eye colors change to something scarier, and she turns into [[EvilIsSexy a hot version of the Silver Surfer]].]]
** Viral also has HellishPupils, and he's a particularly BadassLongcoat in a series that runneth over with badass. {{Justified|Trope}} in that he's part cat-shark-man, so he has cat-like pupils.
** [[spoiler:Nia's father]] Lord Genome has spiral-shaped eyes, but this is less to show him as being evil (since he's a WellIntentionedExtremist) and more to emphasise his badassery and mastery of Spiral Energy.
* ''Manga/DGrayMan'':
** When the [[OurVampiresAreDifferent not-quite-a-vampire]] Arystar Krory drinks the blood of an Akuma, his hair stands up and his eyes get this black veiny sunken look to them. He is a good guy, though.
** Allen Walker has a cursed eye, which goes black with concentric red rings when he spots an Akuma.
** Beside having goden eyes in his noah form like all Noah, the earl of Millennium has slitted pupils.
*** Major spoiler ahead [[spoiler: Allen Walker in his Noah form too. This serves as a Foreshadowing that the memory inside Allen is that of half the Millennium earl]] Hellish indeed.
* ''Manga/RosarioToVampire'':
** [[ChaoticEvil Kiria]]. Bonus for them being different colored HellishPupils, specifically one vertical slit, one horizontal.
** This is also a common trait among vampires, except Outer Moka (and even then, her SuperpoweredEvilSide has them).
* Karin, a FriendlyNeighborhoodVampire from ''Manga/{{Karin}}'' (aka: Chibi-Vampire), usually has normal eyes. Whenever she gets stressed out, her pupils remain circles but also gain vertical slashes -- a merge of human and catlike pupils in one package. Her eyes also apparently [[SupernaturalGoldEyes turn gold]].
* Nearly all of the hommunculi of ''Manga/BusouRenkin'' display these, as do their human followers. When she's angry, the heroine, Tokiko also displays them.
* The {{Black Cloak}}ed cultists in ''Anime/MaiOtome'' get [[SupernaturalGoldEyes gold cat's eyes]] when they draw upon the power of the Slaves.
* All of the demons in ''Manga/ChronoCrusade'' have these (of course), but some are more evil than others -- in fact, the title character (Chrono) has them, and he's one of the ''good'' guys.
* Rokudou Mukuro of ''Manga/KatekyoHitmanReborn'' has a [[RedEyesTakeWarning red eye]] whose pupil is actually kanji that cycle from one to six, from the six realms concept in Buddhism. Each kanji represents a power derived from one of the realms...yes, including Hell. However, the one Mukuro believes to be the worst is the fifth realm, [[NietzscheWannabe the one of humans.]]
* [[AnAxeToGrind Bardiche]] of ''Anime/MagicalGirlLyricalNanoha'' used to have [[FacelessEye a slitted eye in its]] PowerCrystal. When Fate [[HeelFaceTurn switched sides]], the eye is never seen again (barring her transformation in the ''A's'' movie).
** Speaking of the ''A's'' movie, Vita's pupils go slitted when [[BerserkButton Nanoha damages her hat]] (in the anime, she had WideEyesAndShrunkenIrises).
* In ''Manga/HayateTheCombatButler'' Manga only, Hinagiku and Wataru. It might symbolize their aggressive personalities; as they're certainly not evil. Certain other characters get them when being sneaky/violent, but these two ''sometimes'' have them when not doing anything in particular. There is no meaning, yet. In the anime adaptation, the Superintendent and Wataru normally have the eyes, and Hinagiku can summon it when she gets really annoyed.
* In ''Manga/SoulEater'' Arachne has spiderweb patterns on her eyeballs; Medusa (shown above) has snake-like eyes; Asura has 'eyes' inside his eyes (more like vertical eye-shaped irises).
** Not to mention when [[spoiler:Black Star]] starts showing signs of turning out like [[spoiler:his father (who nearly became another [[HumanoidAbomination Kishin]])]] his pupils sometimes have yellow stars appear in them.
*** [[spoiler:More recently his has taken on a blue color]]
*** [[spoiler:Akane from the spin-off also has them.]]
** This is also inverted somewhat since some normal characters have strange pupils (for example Kid has multi-shaded gold coloured irises while Maka's aren't even visible unless she's getting worked up).
** Kid's eyes can look [[http://www.onemanga.com/Soul_Eater/0/c-07/ kind of creepy]]. Can't see another example of it, though, so might be a one-off. In his case, the main physical indication he's other than human has turned out to be his [[SkunkStripe hair]].
*** [[spoiler: When he becomes a full Shinigami, his pupils permanently turn into skulls.]]
*** Another slightly off indication would be whenever his eyes are drawn triangular and blank white. This has shown up in two particularly intense/serious fight scenes - when he's forced to fight both Black Star and later Mosquito 'seriously'.
** Blair's human form features yellow irises and slitted pupils, akin to Medusa. Justified that she's actually a cat.
* Outright subverted in ''Manga/TheLawOfUeki'' by the title character Kosuke Ueki, who has very narrow slit-like irises (possibly just pupils and no irises at all), and yet he's a very kind and just person. The same is true for his [[SinkOrSwimMentor mentor]] Kobayashi... when his ScaryShinyGlasses aren't in full swing, that is.
* ''Manga/GeGeGeNoKitaro'' has this in spades because let's face it, it's full of fucking ''youkai.''
* Yomi of ''Manga/GaRei''. It's much clearer in the prequel anime, ''Anime/GaReiZero''. Either way, she's more of an AntiVillain than anything else.
* A subversion of this can be found in ''Manga/NatsumesBookOfFriends'', where the protagonist has slitted eyes, but this indicates not that he's a nasty youkai but that he can see them. Played straight with some youkai, who also have slitted eyes and at least start off rather nasty.
* ''Manga/KenichiTheMightiestDisciple'':
** Kisara has catlike eyes. Initially this depicts her as vicious, but a new light gets thrown on this with the discovery that she is actually a closet KindheartedCatLover.
** Aagard Jum Sai, the Muay Thai master of Yami, has asterisk-shaped pupils. [[http://www.onemanga.com/Historys_Strongest_Disciple_Kenichi/375/05/ Not sure how that works]].
* Subverted with [[Anime/BloodyMonday Fujimaru and his dad]], whose Hellish Pupils show up when they're about to do something heroically badass.
* Subverted/played as a variant of MysticEyes in the manga adaptation of ''VideoGame/BreathOfFireIV''. In this 'verse, HellishPupils are seen as Dragon Eyes, signs that the bearer is of great destiny and possessed with PsychicPowers of {{Precognition}} and {{Clairvoyance}} [[spoiler: not to mention being a PhysicalGod]]. (This even extends to a summoner-character developing HellishPupils when voluntarily possessed by CoolBigSis Deis.)
* ''Manga/PandoraHearts'':
** Charlotte, [[OnlyKnownByTheirNickname also known as]] Lotti. Also Zwei and [[spoiler:Leo]].
** [[spoiler:The previous Glen AKA Revis]] has them too.
* Andrea of ''Anime/{{Gankutsuou}}'' has these, which help to highlight his insanity.
* Luka of ''Manga/BetrayalKnowsMyName''.
* ''Anime/DigimonTamers'' has Guilmon do this whenever he smells a Digimon. His normally round pupils go slitted and he starts growling. And it may be due only to their extremely strong bond, but the one time in the series that [[BewareTheNiceOnes Takato]] lost his temper, his eyes underwent the same transformation.
* ''Manga/InuYasha'':
** Inuyasha is a [[HalfHumanHybrid half-demon]] that has SupernaturalGoldEyes with slitted pupils. Considering what those tropes usually represent it is a little surprising that not only is he a good guy he's the ''hero.'' Now, if his pupils turn more slitted and ''blue'' and his [[RedEyesTakeWarning sclera red]], [[SuperPoweredEvilSide then we have a problem.]]
** The same applies to Sesshoumaru. (This also gives a ''really'' good excuse to flee; you don't want to mess with an unbelievably large, powerful, angry, and regally fluffy dog [[{{Youkai}} demon]] lord.)
** Many, if not most, bestial {{Youkai}} also have slitted eyes. And yes, that includes [[TagalongKid Shippo]] and [[TeamPet Kirara]].
** Koga's eyes in fact have ''no'' pupils. By the time of his introduction, we've decided that if a character has not-round pupils, they ain't human.
* ''Manga/BlackButler'':
** When Sebastian is acting especially demonic, his eyes are a dark shade of pink/pinkish red and his pupils are slits
** Also, In episode 12 of Season 2 [[spoiler:Ciel]] also gets turned into a demon, and is shown a few times with eyes similar to Sebastian's.
* Cell from ''Manga/DragonBall Z'' has these in his first form.
* All Dream Demons in ''Anime/YumekuiMerry'' have eyes with pupils of nonstandard shape, which occasionally glow white. Merry herself has rectangular pupils like a sheep's.
* In Sugar Dark, the main character/prisoner/forced grave digger/former private Reed meets Raven, a young mischievous boy who was among the mysterious masked people who ordered him to bury one of the {{Eldritch Abomination}}s and humanity's ancient enemy called the "Dark". He doesn't appear to notice (or perhaps not to further question - what with shit happening to him in such short intervals) that he has goat's eyes.
* Used occasionally in ''Manga/WanderingSon'', typically for Anna or Riku (both characters have TsurimeEyes), but not in a negative manner. It's just used as a cartoonish effect.
* ''Manga/{{Berserk}}'': Guts gets these when he's in his standard action kill-kill-kill mode, which are merely his irises drawn in scribbled detail (its the BlankWhiteEyes or WideEyesAndShrunkenIrises that you need to ''really'' [[UhOhEyes look out for]]). Griffith, on the other hand, has piercing white slitted irises when he is in his Godhand form that is Femto. It makes his KubrickStare all the more terrifying.
* Ren Suzugamori in ''Anime/CardfightVanguard'' has slits for pupils.
* When Yakumo from ''Manga/SazanEyes'' draws power from [[spoiler:Amara]], his eyes become completely white with no pupils at all, along with some other demonic changes.
* In ''Manga/KurokoNoBasuke'', the former captain of the Generation of Miracles, Akashi, has these.
* Taken UpToEleven in ''Manga/ApocalypseNoToride'' (Fortress of The Apocalypse) where the four juvenile delinquents encounter a giant mountain of rotting zombies controlled by an androgynous naked man on the top, using the zombies like a grotesque throne. When Maeda (the most innocent of the gang) catches its attention, said naked man (who was about a half-mile away) uses the zombies to move like a hideous organism at lightening speed, until its only a foot in front of the terrified youth. A close-up reveals that it has [[Manga/{{Naruto}} Sharingan]]-like eyes, with three smaller eyes inhabiting each of its pupils.
* [[{{Kitsune}} Tomoe]] from ''Manga/KamisamaKiss'' has them. So does Mizuki, Sukuna and Akura-Ou.
* Arlong from ''Manga/OnePiece'', when angry, has bloodshot eyes resembling those of a Sea King that's about to attack. Not even Nami, who spent eight years forced to work under him, ever saw him this pissed off.
* In ''Anime/FinalFantasyVIIAdventChildren'', the eyes of the Remnants of Sephiroth have catlike slits for pupils -- as do those of Sephiroth himself, though less pronounced. When Cloud is suffering from a particularly intense spasm from the Geostigma disease, his eyes briefly turn like the Remnants'.
* In ''LightNovel/FateZero'', Gilgamesh has red eyes with snake-like slit pupils. This is emphasized in an extreme close-up on one at the end of Episode 12, and the pupil dilates and contracts several times as he talks.
* Demons in ''Manga/{{Saiyuki}}'' tend to have slitted pupils when not wearing {{Power Limiter}}s.
* Mashiro from ''Manga/ThouShaltNotDie'' ends up with these types of eyes after she snaps.
* [[Manga/HellsKitchen Dogma]] has cross-shaped pupils. Somewhat ironic when you consider that he's a [[OurDemonsAreDifferent demon.]]

[[folder:Comic Books]]
* Franchise/TheDCU's [[ComicBook/TheSpectre Spectre]] sometimes manifests images of skulls where his pupils should be, terrifying those who see him face-to-face.
* [[SuperpoweredEvilSide Super Sonic]], the resident OmnicidalManiac in ''ComicBook/SonicTheComic'' had red spirals instead of pupils. In some stories they seemed to reflect his demeanour; when he was at the peak of his evil powers the spirals were large enough to fill his eyes, but when he was good they shrank noticably.
* From ''ComicBook/ArchieComicsSonicTheHedgehog'' we have [[MorallyAmbiguousDoctorate Dr.]] [[OmnicidalManiac Finitevus]], [[WithGreatPowerComesGreatInsanity pretty]] [[MadScientist nice guy]]...
* In ''ComicBook/{{Supergirl}}'' series ''ComicBook/SupergirlCosmicAdventuresInThe8thGrade'', mischievous reality-warper Mister Mxyzptlk [[https://vignette.wikia.nocookie.net/marvel_dc/images/d/de/Mister_Mxyzptlk_Cosmic_Adventures_001.jpg/revision/latest?cb=20110926155016 has square pupils and golden irises]].
* Comicbook/{{Nightcrawler}} is sometimes shown with these, but [[DarkIsNotEvil/ComicBooks he is the nicest guy!]] [[ComicBook/{{Mystique}} His mother]] on the other hand...
* ComicBook/{{Galactus}} has always had square irises.
* Dodge from ''ComicBook/LockeAndKey'' gets these sometimes.
* The first "Alien Invaders" (or so they believe) the ''ComicBook/PaperGirls'' run across have triangular pupils. [[spoiler: though it turns out to be a RedHerring as they are actually the good guys, or at least the least hostile faction.]]

[[folder: Eastern Animation]]
* In ''Animation/SuurToll'', Vanatühi the devil has three red pupils.

[[folder:Fan Works]]
* In [[http://copperbadge.fanficauthors.net/Cartographers_Craft/index/ The Cartographer's Craft]], Peter Pettigrew performs a ritual to immensely increase his power, and his eyes are afterwards described as "yellow, with cross-shaped pupils; a goat's eyes."
* Nyx in ''FanFic/PastSins'', inherited from [[WesternAnimation/MyLittlePonyFriendshipIsMagic Nightmare Moon]], [[spoiler: because she is Nightmare Moon reincarnated.]]
* ''FanFic/TheRiseOfDarthVulcan'': As part of the [[TookALevelInBadass badass upgrade package]] he receives from Vulcan and [[spoiler: Chrysalis]], [[MookLieutenant Artful Dodger]]'s eyes are magically enchanted to increase his natural vision and grant him night vision, with a side effect being that they become cat-like, with slitted pupils and a slight glow.

[[folder:Films -- Animated]]
* Justified in ''WesternAnimation/{{Rango}}'': Rattlesnake Jake is a western diamondback rattlesnake, so it makes sense for him to have slit pupils. The flaming-red irises certainly aid the hellish look, though.
* Professor Screweyes from ''WesternAnimation/WereBackADinosaursStory''. True, his left eye is actually a screw buried deep on his eye socket, but the fact that the screw's slit is in a vertical position (instead of in a diagonal or horizontal one) pretty makes it look like the pupil of a snake or a cat.

[[folder:Films -- Live-Action]]
* [[CrowningMomentOfAwesome The]] [[MagnificentBastard Master]] [[RuleofCool in]] [[RuleofScary the]] ''Series/DoctorWho'' [[TheMovie movie.]] The last time we saw him in the series, he was fighting off the effects of turning into a cat-like creature with the same result.
* Megumi the [[http://en.wikipedia.org/wiki/Yurei Yurei]] spirit does this in the [[ForeignRemake American version]] of ''Film/{{Shutter}}'', she has a scene where her eyes widen and her pupils go inhumanly small. Very creepy effect.
* In ''Film/{{Aliens}}'', Lance Henriksen wanted to have his android character sport a pair of Hellish Pupils while performing his Facehugger autopsy, but director James Cameron declared that Henriksen's eyes were creepy enough as-is.
* Dren in ''Film/{{Splice}}'' has cross-shaped pupils, as an indicator of her hybrid nature
* In ''Film/InTheMouthOfMadness'', the [[AxCrazy ax-wielding maniac]] who attacks Trent early on has eyes with ''two'' pupils that overlap one another.
* In ''Film/GalaxyQuest'', Sarris's eyes are yellowish-green with dual pupils (one large one and a smaller one next to it).
* An eye with HellishPupils appears in the trailer for ''Film/{{Battleship}}''.
* Evil magic user Zenobia does this in ''Sinbad and the Eye of the Tiger'' manifesting feline eyes (for a few seconds) when using her full powers. (She does this ''twice'' during the film.)
* Employed subtly in ''Film/LetTheRightOneIn'': Eli's pupils turn slitted [[MST3KMantra in the dark]] and when [[OurVampiresAreDifferent her inner vampire comes to the fore]].
* Poor [[Film/TheManWhoFellToEarth Thomas Jerome Newton]]. Beneath the contact lenses he wears as part of his AlienAmongUs disguise, he has reptilian eyes -- yellow with slit pupils. He's a TragicHero and a subversion of this trope, but it doesn't keep his human mistress from regarding his true form as hideous.
* The devil mating with Rosemary in ''Film/RosemarysBaby'' is shown to have yellowish cateyes. Their baby is suggested to have inherited them as well.
* Lucifer in ''Film/AngelHeart'' has these.
* ''Film/WhoFramedRogerRabbit?'' has [[spoiler: Judge Doom in his Toon form]] such scary eyes that they could count as {{Eldritch Abomination}}s.

* The mage Raistlin from the ''TabletopGame/DungeonsAndDragons''-derived ''TabletopGame/{{Dragonlance}} Saga'' has pupils shaped like hourglasses, a side effect of a [[BlessedWithSuck magical talent]] he received when young. Naturally, Raistlin has SupernaturalGoldEyes, too.
* ''Literature/GoodOmens:'' [[NobleDemon A. J. Crowley]] has yellow, snake-like eyes (six thousand years ago he ''was'' a snake, hence the fact that he occasionally hisses, doesn't blink much, and can do 'odd things' with his tongue), hence his CoolShades. Crowley is a demon who lives in a fantastic London flat, designed the M25 London ring-road as one of his most evil deeds, and drives a Bentley. His shades are pretty damn cool.
* ''Literature/HarryPotter:'' Voldemort has slit-pupiled, red eyes.
* Mr. Teatime, the psychopathic assassin from Creator/TerryPratchett's ''Literature/{{Discworld}}'' novel ''Discworld/{{Hogfather}}'' has jaundiced eyes with creepy pinpoint pupils. The fact that he only has one eye doesn't detract from this - indeed, his glass eye is described as being the ''less creepy'' one.
* ''Literature/PercyJacksonAndTheOlympians:'' Ares has these in the form of literal hellfire when he removes his CoolShades. They get hotter as he gets angrier, at one time melting his sunglasses.
* The Westfolk (elves) from Katherine Kerr's {{Literature/Deverry}} novels all have catlike eyes (big irises and slit pupils), though they aren't exactly harbringers of trouble... most of the time...
* ''Literature/TheWitcher'': All Witchers gain catlike eyes during their mutation. This enables them to see in the dark, but also makes them distinctly more badass. And, coincidentally, in bright light as well (Pointed out in-text, when Geralt's pupils turned into thin slits, giving him an advantage in a fight). A cat's eye not only looks cooler, it's simply more awesome.
* A somewhat minor (can TheDragon have a dragon?) villain in the ''Literature/XWingSeries'', the petty crime lord Zekka Thyne, has [[RedEyesTakeWarning red eyes]] with diamond-shaped pupils edged in gold, which reflect light when he's in the dark. The heroes are very happy to take advantage of this and [[NoNonsenseNemesis shoot him]] when he's trying to sneak around. (It happened ''twice'', and one of them even warned him earlier that if he slipped up he'd be tracked down by his "[[Narm/StarWars double-diamonds]]". No one told him about goggles, apparently.) Justified in that he's apparently some kind of HalfHumanHybrid.
* The HotWitch in ''Alchemy'' by Creator/MargaretMahy has eyes that initially appear normal, but turn yellow and catlike when examined closely. Somewhat surprisingly, she's a good guy--the antagonist is even creepier.
* [[Literature/TheChroniclesOfThomasCovenant Lord Foul]] has eyes like decaying fangs. It's not entirely clear what is meant by this simile, but it's probably not anything good.
* In ''Literature/TheLordOfTheRings'', Sauron is represented (in visions, and from there as a metaphor) by a great eye, with a slit pupil and yellow like a cat's, and [[IncendiaryExponent rimmed with fire]]. In Peter Jackson's film version, of course, that eye ''was'' Sauron.
* In the MagicTheGathering novel ''Champion's Trial'', Kei Takahashi is [[spoiler: being transformed into a humanoid wasp.]] His eyes turn yellow-green with red pupils, which is nasty enough; however, his pupils then begin to divide, over and over, [[spoiler: becoming the compound eyes of an insect.]] Creepy.
* Shahmeran in the ''Literature/LeagueOfMagi'' stories has eyes that go vertically slitted like a snake's whenever she manifests her powers (but remains in human form.
* The Knife in ''Literature/TheDollmaker'' has eyes that look like hourglasses. She's not really evil, but she's definitely inhuman, and doesn't have much against a little light murder.
* In ''Literature/DarkHeart'', this is the first sign of Myrren Kahliana's dark side emerging, along with her developing magical power.
* ''Literature/WarrenTheThirteenth'':
** Subverted with Sketchy, who looks terrifying in part to his slit-shaped pupils, but turns out to be very friendly.
** Aunt Annaconda has these to make her look similarly creepy, and possibly to indicate that she's a witch. They're especially prominent during her VillainousBreakdown.
* In ''Literature/MaledictionTrilogy'' [[OurElvesAreDifferent Winter Queen]] appears to human girl [[TheProtagonist Cecile]] as a perfectly beautiful woman, with glossy black hair, silver eyes, pearly teeth and perfectly manicured rosy nails. However, from time to time, especially when she loses control of her temper, her real nature pushes through her glamour, showing things like claws, pointed teeth and eyes with slit pupils. And she is highly dangerous, planning [[spoiler: total destruction of all trolls]].

[[folder:Live Action TV]]
* ''Series/StarTrekVoyager'': Members of Species 8472, one of Trek's few completely non-humanoid alien races, have cross-shaped eyes. How nasty are they? The ''Borg'' are terrified of them.
* The Silicates ([=AIs=]) of ''Series/SpaceAboveAndBeyond'' also had crosshair eyes.
* Those infected by the Cheetah taint in the ''Series/DoctorWho'' story "Survival" develop cat-like pupils.
* On ''Series/TheSarahJaneAdventures,'' the Bane have pupils somewhere between heart- and apple-shaped.
* 'Deathwalker' from ''Series/BabylonFive'' had cat eyes.
* ''Series/TheXFiles'':
** Seen at the end of "Terms of Endearment" [[spoiler:revealing that the supposedly 'normal' wife of the demon is actually a demon herself.]]
** And in "Die Hand Die Verletzt", when the teacher-demon-lady-whatever-thing was carrying out her/its rituals.
** Also in "Teso Dos Bichos", a rather infamous episode featuring [[spoiler:sewer killer pussy cats summoned by a jaguar spirit]], a shaman of Ecuador had cat-like eyes as well.
* Inverted on ''Series/CriminalMinds'', when a homicidal taxidermist replaces the realistic glass cat eyes of a preserved bobcat with the ''real'' eyes of the man who'd brought the animal in to be stuffed.
* The Wraith of ''Series/StargateAtlantis'' have both the slitted pupils and the yellow iris. And they are pretty creepy. Well, at first.
* The "defiant pupil" in ''Series/{{Zoo}}'' is a distortion of the left eye's pupil, which all of the unnaturally-hostile animals seem to display.

[[folder:Myth and Legend]]
* Virgil describes Charon as having eyes "like hollow furnaces on fire."

* The Devil in ''Pinball/DevilsDare'' has green pupils with reptilian slits.

[[folder:Puppet Shows]]
* [[Series/TheMuppetShow Kermit the Frog]] obviously isn't evil but he does have odd horizontal pupils with a bulge in the middle. Real frog species feature a variety of pupil shapes as well as irises often colored similarly to the rest of the frog, meaning that some species do have eyes resembling Kermit's, such as [[http://browse.deviantart.com/?q=frog%20photograph&order=9&offset=96&offset=144#/d34fbz1 the leopard frog]].

[[folder:Tabletop Games]]
* One piece of ''TabletopGame/{{Warhammer}}'' art depicts a pair of eyes with the [[EldritchAbomination eight]]-[[TheCorruption pointed]] [[BigBad star]] [[OmnicidalManiac of]] [[ReligionOfEvil Chaos]] for pupils. As a general rule: if you are in the Warhammer world and you see someone with those symbols in their eyes looking at you, it may be time to take a long vacation. And it's probably best if you don't stop to pack.
* Urik von Kharkov, a ''TabletopGame/{{Ravenloft}}'' darklord who can change into a panther, develops slitted pupils when he gets angry.

[[folder:Video Games]]
* When Chris gets possessed by Orochi in ''VideoGame/TheKingOfFighters '97'', his eyes become slitted and yellow; however, this only part of the transformation.
** This editor saw him with {{red eyes|TakeWarning}} in that form...maybe it was changed to that in '98 and/or '02.
** Goenitz also gets slitted pupils before fighting in ''The King of Fighters '96''; and in the Neo-Geo pocket games, the Heavenly King version of Yashiro and Chris also have these kind of eyes. Shermie? [[HiddenEyes Who knows]].
* Beckett from ''VideoGame/VampireTheMasqueradeBloodlines'' has slitted cat pupils and eyes that are ''completely'' red -- a side-effect of his vampire clan. He is, however, neither a villain, trouble, nor particularly sinister -- the worst he'll do is [[DeadpanSnarker be sarcastic at you]].
* Sephiroth, BigBad of various incarnations of ''VideoGame/FinalFantasyVII'', has the slitted cat-like variety, compounded with those oh-so telling "[[GlowingEyesOfDoom Mako]]" eyes. His eyes were always like that, even before he turned bad, presumably because of Jenova's cells. This is especially evident in ''VideoGame/CrisisCore''.
* ''Franchise/{{Disgaea}}'':
** Many demons have this. Rozalin of the [[VideoGame/Disgaea2CursedMemories second game]] [[spoiler: and other members of Veldime's Snow Clan]] takes it a step further by having ''white'' slitted pupils.
** (Human) Princess Sapphire, from the [[VideoGame/Disgaea3AbsenceOfJustice third game]], has white star-shaped pupils. Seeing as she's conclusively [[AxeCrazy off her nut]], it would be safe to call them hellish.
* Rikku and the Al Bhed people of ''VideoGame/FinalFantasyX'' have spiral-shaped pupils. They're not evil, though, just quirky and a tad ornery. Yuna has one eye like this, as she's half-Al Bhed (Rikku is actually her cousin, in fact).
* Solid Snake has slit pupils in the UsefulNotes/NintendoGameCube [[VideoGameRemake remake]] of ''VideoGame/MetalGearSolid''. However, they only appear in that particular game and he's not terribly evil despite the violence supposedly latent in [[InTheBlood his genes.]]
* ''VideoGame/TheWorldEndsWithYou'':
** The first step of Konishi's OneWingedAngel is heralded with her taking her glasses off as her eyes turn into green cat's eyes. Her monstrous form, appropriately enough, is Tigrus Cantus.
** Minamimoto's eyes, on the other hand, are constantly yellow and catlike -- his form is Leo Cantus.
* ''Franchise/ResidentEvil'':
** Albert Wesker's cat eyes, which were first seen in ''Code Veronica''. Possible ShoutOut to Music/MichaelJackson's ''Thriller''.
** [[http://i1-news.softpedia-static.com/images/news2/Resident-Evil-2-Dual-Shock-Edition-Cheats-and-Unlockables-PSX-2.jpg The cover art]] of ''VideoGame/ResidentEvil2'' features a zombie with slit pupils holding the "2" part of the title.
* If you pay close attention to the skits in ''VideoGame/TalesOfSymphonia'' you'll notice that Presea's pupils are black while the pupils of the rest of the cast are white. She's not evil though.
* Mephiles' eyes after taking on the shape of Shadow the Hedgehog in ''VideoGame/SonicTheHedgehog2006''. Despite this combined with [[NoMouth him not having a mouth]] and his evil-sounding voice, Silver doesn't seem suspicious in the slightest during their first meeting. The trope becomes even more apparent in Mephiles' crystalline form.
* Humanoid Shadows in ''VideoGame/{{Persona 4}}'' have these. Once denied by their human counterparts (the last step to being killed by one is to shout "YOU'RE NOT ME!"), they turn into full-out GlowingEyesOfDoom just before the transformation.
* Lara's Doppelganger in ''VideoGame/TombRaiderUnderworld'' has pupils that constantly reflect light like a cat's.
* The UsefulNotes/PlayStation game, ''VideoGame/TheLostWorldJurassicPark'' (loosely based on the movie) allows the player to control multiple characters throughout the game, including three dinosaur characters. The strength of the dinosaur characters' attacks are governed by an "Instinct" meter in the upper corner, which takes the form of an eye. The eye starts off as a green iris with a large, circular black pupil. The character can pick up items to change this, including a Full Instinct item, which makes the eye in the corner a blazing red, with a slit pupil. This Instinct boost causes the player's attacks to be significantly stronger, and the player must kill enemies in quick succession in order to keep the Hellish Pupil, otherwise the eye color begins to transit backwards through orange, yellow, and back to green, with the pupil changing back to a more circular shape. Obtaining Instinct and keeping it maintained is an important part of gameplay, as having full Instinct can make bringing down even the hardest of bosses a matter of only attacks hits, so it really pays the player to obtain the Hellish Pupil and keep it that way.
* [[spoiler:Nessiah]] from ''VideoGame/YggdraUnion'''s eyes were probably like this, considering that the one that's in the Gran Centurio has a slitted pupil.
* VideoGame/{{Klonoa}} from his eponymous video game series, is a heroic example, with catlike slit pupils surrounded by equally catlike golden irises. The pupils have widened somewhat over the course of several installments and spinoffs and currently resemble SonicTheHedgehog's eyes more than the full-on cat eyes he had in his first game. Then again, Klonoa IS a Cat.
* Date Masamune from ''VideoGame/SengokuBasara'' has slitted pupils ([[EyepatchOfPower well, one at least]]), despite being an ordinary human by the game's standards, and though questionably insane he's by no means evil. However he is often referred to as a "dragon", and whether this is to be taken literally or not his design sports a lot of dragon motifs.
* ''[[VideoGame/{{Touhou}} Touhou Project]]'' offer Nue, who's missing her pupils almost entirely (they're just darker red spots). Despite ZUN being famously bad at character art, he does normally color eyes correctly, so much of the fandom accepts this as intentional. The Scarlet Sisters Remilia and Flandre also sport slit pupils.
* [[LadyOfBlackMagic Morrigan]] of ''VideoGame/DragonAgeOrigins'' has cat's-eye pupils and SupernaturalGoldEyes. Unsurprisingly, she's a TokenEvilTeammate and a shapeshifter.
* ''VideoGame/{{Catherine}}'' likes this trope. Vincent briefly displays rectangular goat-style pupils each time he wakes up from a nightmare, [[spoiler: Thomas Mutton has eyes shaped like the spear of mars and the cross from the mirror of venus]], and [[spoiler: Catherine and Vincent have variants of these in the True Cheater ending]].
* The [[PsychoRangers Materials]] from the ''VideoGame/MagicalGirlLyricalNanohaAsPortable'' games possess these, signifying their connection to the [[EldritchAbomination Darkness of the Book of Darkness]].
* As mentioned in Literature, Witchers in ''VideoGame/TheWitcher'' tend to have these of the slit catlike variety.

[[folder:Visual Novels]]
* ''VisualNovel/FateStayNight'':
** Rider possesses square pupils, and as they're usually covered in the original game people only realize this right before being TakenForGranite by her powers.
** Gilgamesh from the same game has slitted pupils and red eyes, Which is a trait all demigods have.
** So does Lancer; it might be Fate-continuity shorthand for marking out someone who's got [[spoiler: divine ancestry; Lancer is Cu Chulainn, ergo his dad is the god Lugh, and Gilgamesh WOULD be two-thirds divine (not sure how that one works...), but he's had his godly-rating dinged by the fact that ''he really doesn't like the gods very much'' and is thus his usual, er... [[JerkAss charming]] self at them.]]
** Rin has slitted pupils when she's angry. While she ''is'' a magus, it's probably artistic license more than any indication of anything abnormal. She has box pupils in Shirou's dreams. [[spoiler:As does Rider under her mask. [[FridgeHorror This isn't a coincidence]].]]
* The dragon's eyes in ''VisualNovel/DraKoi'' are slitted even as a human. The protagonist thinks they look reptilian.

[[folder:Web Comics]]
* ''Webcomic/LastRes0rt'': Jigsaw's pupils and irises turn red, with the whites replaced by black, when she really loses her temper. It's one of the signs that she's a vampire, and her powers seem to get a significant boost when it happens. It's not something she wants people to see, though - she's trying to keep the fact that she's a vampire under wraps.
* [[ByronicHero Vriska Serket]] from ''Webcomic/{{Homestuck}}'' has one normal eye and one eye with seven pupils, though she considers them to be seven different eyes. It fits the "hellish" part perfectly, since she's the TokenEvilTeammate (and considering [[CrapsackWorld where she lives]] and [[OurTrollsAreDifferent who her]] [[{{Jerkass}} teammates are]], that's really saying something!) It also fits her "eight" NumerologicalMotif.
* Kit from ''Webcomic/TheDreadful'' has vertically slitted eyes, to go with her demon girl motif.
* In ''Webcomic/ElGoonishShive'', the transformation from normal pupils to this is used [[http://www.egscomics.com/?date=2004-04-17 here]] to signal the beginning of Grace's (almost) UnstoppableRage.
* Most {{Hellhound}}s in ''WebComic/{{Wurr}}'' spot these. [[DarkIsNotEvil They are nicer than they look.]]
* in ''Webcomic/CommanderKitty'', [[BigBad Zenith]] combines this with RedEyesTakeWarning [[http://www.commanderkitty.com/2010/07/25/whose-side-are-you-on/ when she meets her "sworn nemesis" Nin Wah again]].
* Satan, being Satan, has snake-like pupils in ''Webcomic/SatanAndMe''.
* Urek Mazino from ''Webcomic/TowerOfGod''.
* [[spoiler:[[BigBadFriend Dio Varus]]]] from ''Webcomic/BlackHaze'' has these [[spoiler:in his demon form and accidentally in his human form]]. Unusually for this trope, the sudden change to this is ''exactly what'' alerts Rood to the fact that [[spoiler:Dio isn't human]].

[[folder:Web Original]]
* In ''Roleplay/TheGamersAlliance'', [[LadyOfBlackMagic Shyralis]] has snake-like slitted eyes, and this disturbing appearance is part of the reason why she was bullied as a kid.
* In ''[[SpinOff More]] Literature/TalesOfMU'', a dragon is described as having "jagged diagonal pupils".
* Tetras from ''FanFic/TheMotleyTwo'', a descendant of ''Homestuck'''s Vriska Serket described above, has four pupils in total (three in the left eye). Her NumerologicalMotif is, of course, four.

[[folder:Western Animation]]
* In ''WesternAnimation/CodeLyoko'', the symbol of the AI antagonist XANA is a stylized eye. Humans and animals possessed by XANA have their pupils replaced by this symbol. (It also appears somewhere on all of XANA's monsters in the [[{{Cyberspace}} virtual world]], usually as a [[AttackItsWeakPoint weak spot]].)
* The version of Adrian Toomes (a.k.a. the Vulture) seen on ''WesternAnimation/TheSpectacularSpiderMan'' has comma-shaped pupils, which look particularly odd when he's out of costume.
* ''WesternAnimation/BeastWars'':
** Megatron doesn't just have regular red eyes, he also goes around with reptilian pupils when he's in Robot Mode. This becomes especially noticeable when he goes Transmetal.
** ''GentleGiant:'' Rhinox gets {{red|EyesTakeWarning}} {{glowing|EyesOfDoom}} slit-pupiled eyes when he is temporarily [[BrainwashedAndCrazy turned into a Predacon]].
* ''WesternAnimation/BatmanBeyond'':
** Several characters get these in the episode "Splicers", from getting [[HalfHumanHybrid animal DNA]] [[ExactlyWhatItSaysOnTheTin "spliced" into]] their own.
** Derek Powers had this even before becoming Blight. His eyes were black with white pupils.
* ''WesternAnimation/{{Futurama}}'':
** Bender has square pupils. Okay, so all of the robots do. Not like they're the paragons of future society, though.
** All glory to the Hypnotoad!
* WesternAnimation/{{Pandamonium}}: The cosmic villain Mondraggor has catlike slit-pupils.
* Jinx of ''WesternAnimation/TeenTitans'' has narrow, cat-like pupils, but she's [[DarkIsNotEvil not exactly]] [[AntiVillain "evil,"]] [[HeelFaceTurn just fell in with the wrong crowd]].
* Disney's ''WesternAnimation/TheLegendOfTarzan'' played fast-and-loose with the works of Creator/EdgarRiceBurroughs in many ways. The main example of this trope? Queen La, now melded with the Leopardmen and given a pair of catlike eyes.
* Chase Young from ''WesternAnimation/XiaolinShowdown''.
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic''
** Princess Luna's evil persona Nightmare Moon has cat-like green eyes with slitted pupils.
** Queen Chrysalis of the Changelings has, not one, but ''two'' irises in each eye, accompanying the viper pupils.
** The unicorn GenericDoomsdayVillain King Sombra has slitted pupils, red irises and green scleras, and on top of all that, his eyes emit a purple mist.
* The Diamonds from ''WesternAnimation/StevenUniverse'' have diamond-shaped pupils.
* 'WesternAnimation/GravityFalls'':
** The dream demon Bill has one massive, yellow-tinged eye with a slit pupil. Anyone who makes a deal with him and is subsequently [[DemonicPossession possessed]] also has the creepy eyes, as well as an [[UncannyValley unnaturally detailed]] face.
** Gompers, the Mystery Shack's goat, has similar eyes...which isn't all that unusual for a goat.

[[folder:Real Life]]
* People who have undergone cataract surgery are often left with keyhole-shaped pupils on the surgical side.
** A coloboma in the iris can also lead to keyhole-shaped pupils.
* A certain defect in the iris can result in a cat's-eye-like appearance.
* While slitted pupils are most commonly associated with cats and reptiles, they also show up on some [[ThreateningShark sharks]].
** [[CunningLikeAFox Foxes]] have eyes like this too.
** Goats also have hellish pupils, but they are more rectangular and are horizontal instead of vertical. This can make them creepy looking to some people.
* Funny enough, the most dangerous, venomous snakes (the Elapid family), and big cats, have round pupils.
* [[https://en.wikipedia.org/wiki/Tache_noir_de_la_sclerotique Tache noir de la sclerotique]] gives this sort of effect, crossed with plenty of EyeScream, but actually is a sort of subversion, in that it's the ''sclera'' that's hellish. It's generally a side effect of DiesWideOpen, as a result of air getting into the open eyes of the corpse (who obviously can't blink to clear them anymore). ''Don't look it up'' if you have a [[NauseaFuel weak stomach]] or [[NightmareFuel nervous disposition]].