I've had twice the adventureThe chance of having conjoined twins is as much as 1 in 100,000; the chance of those twins surviving infancy is 25%. As of 2008, there are under 2,000 conjoined twins in the world, and about a dozen are living in the United States. You're more likely to get struck by lightning — twice! — than to meet a set of conjoined twins. But don't tell that to Hollywood — according to them, the chance of our heroes meeting two people who share one body is higher. Much higher. Conjoined Twins combine Creepy Twins with Body Horror: Imagine being attached to another person, the same one person, for your entire life. Freaky stuff.note As such, they are a staple of horror and any show that wants to unsettle its viewers. They are a must at carnival freak shows. If the twins aren't just background characters, most other Twin Tropes will apply. Twin Threesome Fantasy is a notable exception; if the idea comes up at all, expect other characters to be squicked out. If anything, it seems to be more common for someone to fall in love with one twin only to find it very awkward having their sibling around all the time. Some cases may literally have been Separated at Birth. Multiple Head Case is a subtrope, about the tendency of beings with two heads to have opposite personalities. For our purposes, people who aren't born twins, let alone conjoined ones, but somehow still get fused together apply. With the exception of such artificial fusions, depictions of this trope which connect in places other than the body's axis (head, neck, or torso) are artistic license. Conjoined twins are also Always Identical Twins; those that aren't are likely running on Rule of Funny. May manifest as A Head at Each End in drastic cases. Conjoined Twins are a real phenomenon, and have been around pretty much forever. They became prominent in the 1800s with the rise of carnival freak shows; the most famous pair was Chang and Eng Bunker, the original "Siamese twins". who were connected at the sternum. Most of the examples below are taken from The Other Wiki's page. For the most part they are complete enough to be easily separated, making them regular twins, or the parents decide to sacrifice one for a simpler or better life for the other which results in a single person, and there also exists the parasitic conjoined twin, which has additional limbs or organs, but doesn't have a brain of its own and is usually removed early in life.
I've cried double the tears.
I've had two times the bad times,
In only half the years...
I've cried double the tears.
I've had two times the bad times,
In only half the years...
— "Twice the Love" (the "Siamese Twins Song"), Big Fish
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- One Apple Jacks commercial had Apple and CinnaMon get stuck together after they crashed into each other. They remained like this for a few of the commercials until they came unstuck via a special machine.
Anime and Manga
- The creepy twins Sakon and Ukon from Naruto are conjoined... most of the time. Thanks to their special power they can meld their bodies into Multiple Head Case, turning Multiarmed And Dangerous or separating for tag team attacks whenever needed.
- Black Jack:
- One of the "sealed chapters", "The Two Jans", has Black Jack operate on a little boy with two brains and two faces, but only one body.
- Also, this is Pinoco's origin... sorta. She was supposed to be the twin sister of a young girl but her body was absorbed into her in the womb, thus becoming a sort-of parasitic twin — basically, a sentient tumor in her body. Black Jack removes the "tumor" but senses Pinoco's wish to live, thus he builds her a small body and adopts her after her "sister" rejects her.
- Yudy and Yucy in the short story Henshin: Half God.
- The sisters Raphaela and Luciella end up turning themselves into this in Claymore. Until they wake up.
- In InuYasha there was a tribe of harpy-like bird demons whose leaders were two twin brothers sharing the same bird-like lower body. Much later in the story, the group meets two conjoined demon brothers who are at war with each other.
- Thomas Kuebler's sculptures of Cletus and Shorty, a two-headed pair of old men joined at the neck, not too bright but jolly.
- One comedy bit from Jeff Foxworthy is about his twin cousins Larry and Lonnie, joined at the hip. "They're vacationing in England because Lonnie wants to drive the car for a change."
- In his stand-up show Change Management, Andy Hamilton tells a joke about conjoined twins, making the point that it's possible for such a joke not to be at the expense of conjoined twins.
- 1950s comic stories published by EC Comics often featured conjoined twins, usually revealed in a surprise twist ending.
- There's a Nightwing villain(s?) that is two men who were fused together by some sort of toxic goo.
- Castle Waiting: A pair of conjoined twins are billed as a two-headed girl at a circus (as the owner thinks that's more interesting than two girls joined at the waist).
- In the Buffy the Vampire Slayer: Origin comic, Buffy fights a set of opposite sex conjoined twins who are running a casino-cum-vampire factory in Las Vegas. The brother is a vampire, and the sister is a good shot with her guns, making them a potent enemy. At the end, Buffy put holy water in the sprinkler system, then activating it, killing every vampire in the casino — including the brother. The human sister was left alive.
- Divangelic from Empowered. A pair of twins — the left one, Charity, is an angel, the right one, Vanity, a devil. Literally speaking.
- In The Incal and The Metabarons, there are Janus-Jana, the Sacred Androgyne and Emperoress of the Galaxy.
- The story "And The Executioner Wore Stiletto Heels" features Two-Tone, a pair of brothers (one white, one black) who essentially form a single, two-headed mob hitman. Their condition has no bearing on the plot though, and most likely the writer made them this way just to add something memorable to an otherwise bland story.
- The Joker has a conjoined twin as part of his Amusement Park of Doom in The Killing Joke. They don't contribute to the plot beyond aiding the Joker's attempts to drive Commissioner Gordon insane, and run off when Batman shows up.
- A two-part story features "Schism, the Skinner Twin", a pair of conjoined twins at a carnival with their whole bodies fused, giving them the appearance of one person with two noses and mouths and three eyes and, as it turns out, three arms. Mal Skinner is mean and bad-tempered and Cal Skinner is cheerful and friendly. Inevitably, they run into Two-Face.
- In The Transformers two of the Wreckers are Rack'n'Ruin, two Autobots who were fused to save their lives.
- Moe and Joe Dubelz, in Garth Ennis' Hitman are a pair of conjoined twins who head the Dubelz crime family. After Tommy shoots Joe in the head, Moe attempts to have Tommy died before their shared body eventually dies.
- Black Moon Chronicles: Ghorghor Bey's first love(s) as a young man were the conjoined sisters who travelled along as part of the Freak Show exhibition of the traveling circus group that Bey had joined. They were later killed by a swamp monster when the group had to escape the clutches of an evil nobleman. Bey did get his revenge on the duke in question, but he wasn't reunited with the twins until years later when Wismerhill resurrects them as a token of friendship to Bey and even goes to the trouble of giving them separate bodies.
- From an Animaniacs fan series called Zany To The Max:
- Zak and Ko Warner; they are not biologically conjoined, however. Back when they were 3 years old, they crashed into each other and have been conjoined ever since.
- In one episode, it is mentioned that all members of their species have this ability, but it's hard for them to separate.
- Wakko has been conjoined a few times as well. In the episode "WakDot", Brain uses his new invention, a conjoining device, on Wakko and Dot. In the episode "Conjoin the Warner Brothers," Slappy gave seven of the eight Warners a part in a play, with Yakko being left out. During the night, Yakko took a wishing stone from his bedside table and said, "I wish I could join with Wakko." Because wishing stones are Literal Genies, Yakko and Wakko wake up the next morning conjoined! At the end of the episode, it's revealed that Wakko got two parts in the play, one being the narrator, so Slappy let Yakko be the narrator instead.
- The Yarner twins are also a pair of conjoined twins (biologically, this time).
- Wacka and Wakka Marakka are conjoined twins (not actually twins, Wakka is older) who are parodies of Terri and Terry Perry (see Films below). One episode reveals that their being conjoined is the result of a gene-splicing experiment.
- A Homestar Runner fan series with the same author has Coach C and her brother, Coach D, who became conjoined in the fan sbemail "virus 2" as a result of The Virus. There was one twist, however. When the Zappy XT6 (Strong Bad's computer at the time) exploded, the affects of The Virus were gone, except for one: Coach C and Coach D were still conjoined, and they remain conjoined to this day.
- Also there's the Twins, who used to be conjoined twins before arriving in Free Country USA.
- Homestripe and Slipstar become conjoined in the toon "SlipStripe Runner".
- The same author has created the following conjoined Mr. Men characters: Mr. Two-in-One and Little Miss Conjoined, both of which are biologically conjoined.
- One of this author's fanon characters, Little Miss Knots, has been conjoined with a canon character, Little Miss Somersault, on occasion.
- According to the same author, characters can apparently become conjoined by means of a Borfin. This has happened to Odd Squad agents Otto and Olive in Skip the Borfin. It gives Olive the skips.
- In the Ranma ― fanfic Two for the Price Of One, Ranma arrives at the Tendo Dojo and discovers that Nabiki and Akane are dicephalic (two heads, one body) conjoined twins. Nabiki wants the engagement, Akane doesn't, and both of them are convinced Ramma agrees with their position.
- An artist on DeviantArt has created some Pokemon Trainer Original Characters, most of them female and conjoined twins. Megan and Molly Fangz, for instance. But the weird thing is, not only his twin characters are conjoined, but always barefoot as well.
- Vocaloid fanfic Rotting Camellias has Rin and Len as this, although they weren't born that way ...
- In The Legend of Spyro: A New Dawn, the Big Bad Deadlock is actually a set of three conjoined sisters, not simply a three-headed dragon.
Films — Animation
Films — Live-Action
- The 2000 Nickelodeon original movie Cry Baby Lane is centered around the legend of a pair of Siamese Twins separated at death:One good and one evil.
- Big Fish stars twin sisters Ada and Arlene Tai as conjoined twins/Korean Glamorous Wartime Singers, Ping and Jing (pictured above). One of Edward's many Tall Tales has him meet them while MIA during the war and escaping with them to the West. They really do exist, but are not actually conjoined.
- The independent film Sisters, an early Brian De Palma effort, features conjoined twins who were previously separated.
- The 1983 splatter film Basket Case and the two sequels center on conjoined twins Duane and Belial Bradley, who were separated by back-alley doctors against their will at a young age.
- Twin Falls Idaho centers on reclusive conjoined twin brothers.
- Stuck on You stars Matt Damon and Greg Kinnear as non-identical conjoined twins, a medical impossibility (or at least, there is no recorded case).
- The 2005 mockumentary Brothers of the Head follows conjoined twin brothers who form a rock band.
- Alone is a 2007 Thai horror film about two conjoined twins.
- Flora and Fauna from The Addams Family movie.
- There was a pair of conjoined twins as periphery characters in Not Another Teen Movie, who are considered less weird than Jamie who wears paint-splattered overalls and glasses. They end up being crowned Prom Queen.
- The podrace announcers in The Phantom Menace, although their heads are different for some reason. That may have to do with the fact that it was most likely a trait of their species.
- The Hong-Kong film The Bride With White Hair has opposite sex conjoined twins.
- The Octopus, villainess(es) from The City of Lost Children.
- In Freaked, two of the main characters are melded together with a mutative toxin into non-related conjoined people, sharing the girl's right side and the boy's left side and both torsos, melded at the shoulders.
- In Hellraiser: Bloodline, a pair of twins are joined at the face with their flesh twisted around a bolt of some sort as they are turned into cenobites. They can separate at will (they were regular twins as humans), doing so to horribly kill a third party between them.
- The monster in The Thing (2011) invokes this trope on one of its victims (while he is still alive and screaming), fusing their bodies to create a larger, more intimidating creature (later encountered in John Carpenter's The Thing).
- There's a pair of conjoined twins among Davy Jones' crew in Pirates of the Caribbean, known as Two Head or the Twins. They are played by non-conjoined twin brothers wearing one specially made motion capture suit. After the curse is lifted, they are separated.
- The Girls by Lori Lansens, which is a fictional autobiography of craniopagus twins
- Unsurprisingly, the Mark Twain story "The Siamese Twins" was based on the Bunkers.
- Occurs twice in the Earth's Children series:
- Towards the end of The Clan of the Cave Bear, Uba gives birth to stillborn male conjoined twins. However, Ayla decides it is best if this does not become common knowledge and refrains from mentioning this aspect of the birth.
- In The Land of Painted Caves, Ayla meets a woman who has also given birth to conjoined twins. As in Uba's case, the twins were stillborn.
- Flora and Fauna (again) from Love Will Tear Us Apart. The idea of the novel is "What if the Hilton sisters were in the modern era, and kinda like Britney?"
- Amongst the various medical miracles in John Varley's Eight Worlds future history is a brief mention of a passing fad for voluntary conjoinment amongst jaded thrill seekers
- In The Stone Dance of the Chameleon, the Masters believe conjoined twins, which they call "syblings", to be representatives of the Twin Gods in some way. The twins share the same name ("Left-Name" and "Right-Name" are used to distinguish them if neccesary) and one of them is blinded at birth. All of them are children of members of the Emperor's family and serve as elite guards and servants at the palace. When Carnelian theorizes that the high number of syblings within the royal household may have to do with the divine blood burning in their veins, his father wryly points out that more likely it has to do with the drug cocktails given to pregnant women of the House of Masks to make them bear twins.
- Two of the Binewski siblings in Katherine Dunn's Geek Love are a set of beautiful conjoined twins named Electra and Iphigenia.
- One (bad) Dungeons & Dragons novel featured conjoined twin goblins, attached at the hip, as leaders of a goblin tribe. The book pre-dated 3E's introduction of class levels for monsters, so making them conjoined twins may have been the author's way to justify them having more attacks/round than a standard goblin chieftain.
- Joe-Jim, the mutant leaders from Heinlein's Orphans Of The Sky, are two heads that share the same body.
- Flint Murtaugh, a bounty hunter from Robert R. McCammon's Gone South, has a parasitic twin (Clint) embedded in his torso.
- Not biologically conjoined, but close enough; the "three-headed dragon" in the Redwall book Triss is actually three large adder siblings (two males and a female) joined by a mace and chain which looped around their bodies and was embedded in their flesh during an attack in their childhood. Since they lack hands, they couldn't untie it, and they were forced to grow up bound together, learning to co-ordinate their movements.
- In Jane Lindskold's Wolf Hunting, fraternal twins (boy and girl) Tiniel and Isende were conjoined twins joined at the hand, indicating the author didn't do her research properly.
- In the short story "My Sister and I", the narrator is one of a pair of conjoined twins, a fact which is only revealed in the last paragraph.
- Ellery Queen's mystery novel The Siamese Twin Mystery features a pair of male conjoined twins.
- Margaret Lea in The Thirteenth Tale was born a conjoined twin, which draws her to write about twins. Her sister didn't survive the operation to separate them.
- Due to extensive nuclear testing in the Alternate History of Shelley Jackson's Half-Life, conjoined twins are a thriving subculture. One that narrator Nora wants no part of, despite her sleeping twin Blanche.
- There is a pair of conjoined twins on the train in Kenneth Oppel's novel The Boundless.
- The title of the picture book Jethro and Joel Were a Troll by Bill Peet says it all. Like the real-life Hensel twins, the troll(s) look like one person with two heads. They have very distinct personalities— allowing for their target demographic (ages 4-8).
- Dr. Seuss frequently joined his twin characters together by their hair. Exaggerated in "Did I Ever Tell You How Lucky You Are?" with the Brothers Ba-Zoo.
- Moonshine features Cerberus, a werewolf mob leader who is a pair of conjoined twins to whom everyone refers as one person. He has two heads that each have their own brain and each brain controls one half of the body, which considering his martial prowess is quite a feat of coordination.
- The Hindi serial Amber Dhara, which aired on Sony Entertainment Television India from September 24, 2007 to April 24, 2008, was about two conjoined sisters named Amber and Dhara.
- The 2009 TLC episode Conjoined Twins after Separation about the conjoined twins Iesha and Teisha Turner after separation.
- The Bones episode "Double Trouble in the Panhandle" had a pair of conjoined twins as the Victim(s) Of The Week. The statistics on conjoined twins are mentioned by Mr. Vincent Nigel-Murray, a compulsive trivia-mentioner.
Vincent: Conjoined twin births occur once every 85,000 births, the same frequency as hermaphroditic births.
Cam: Oh, Mr. Nigel-Murray, I so missed your insights.
Angela: Guys, hello! IDing them is not going to be a problem. How many sets of conjoined twins can there be?
Vincent: Um, over the last 500 years approximately 600 sets, over 70% women.
Cam: I did not expect him to know that.
Vincent: Well, all facts are useful. It's just the context that shifts.
- The The X-Files episode "Humbug" features a circus performer whose under-developed conjoined twin separates from him and commits murder.
- Tales from the Crypt, like the horror comics that inspired it, did a couple of Conjoined Twins stories.
- Teen Angel episode 10 "Steve & Marty & Jordan & Uncle Lou" Marty feels left out so he conjoins himself to Steve for a little bit, after Steve comments how "It's not like we're joined at the hip or anything."
- The CSI episode "Pirates of the Third Reich" had a villain doing Nazi style experiments where he surgically created conjoined twins from a set of identical twins. One was dead when the CSIs arrived and the other died at the hospital.
- Carnivāle has a female pair in Samson's travelling carnie show.
- In the Supernatural episode "Devil May Care" (S09, Ep02), we find out that Bobby and Irv hunted werewolf Siamese twins.
- The Monsters episode "The Divided Self" - adapted by Michael Bishop from his own short story - is about two non-identical conjoined twin authors in family therapy.
- In the 4th season of American Horror Story titled "Freakshow", the main characters are a set of twins named Bette and Dot Tattler. Their entire bodies are conjoined so it seems like they are two heads on a body, though they have two hearts and two sets of lungs. They also display opposite personalities.
- In addition, there is a figure named Edward Mordrake, based on the urban legend of the same name, a man from Victorian times who was born with an underdeveloped conjoined twin, seen as a miniature head on the back of his own. Eventually, we discover that he is real in this universe, returned after his suicide as a ghost with a gang of other deceased "freaks", eventually including Twisty (who still lacks a jaw but can at least speak now) and a few from the troupe.
- In 2007, Amanda Palmer and Jason Webley formed a music group called Evelyn Evelyn, the premise being 2 conjoined twins, both named Evelyn, performing music.
- The music video for the song "Dark Woods Circus" features Rin and Len, conjoined at the waist, as the show's "two-headed person". (Actually a pair of fraternal twins that were cut up and sewed together by an insane surgeon.)
- A Miku song called "Lover Rangge" may or may not be about conjoined twins. This is the most popular fan interpretation of the song.
- A supernatural version in the Vermillion Lies song "Long Red Hair", about two sisters joined only at their eponymous long red hair. When it's cut, they bleed out through it, and their corpses are left with white hair.
- The Arrogant Worms deal with this problem in their song Twins, where a pair of unhappy conjoined twins sing about their upcoming surgery:
You want no parts of me and I want no parts of you,
You need both the kidneys, but one'll have to do,
Separation anxiety sounds pretty good to me,
This three-legged race is over!
- The album God in Three Persons by The Residents revolves around two conjoined twins with healing powers and a man seeking to exploit their ability.
- Once, the Weekly World News had a cover "photo" of a set of conjoined septuplets. Who weren't all the same sex. (They also did a story about conjoined sextuplets, who were the same sex. Maybe it's the same story?)
- Side Show is based on the real lives of conjoined twins Daisy and Violet Hilton.
- Peri and Pearl Serpentine from Monster High are dicephalic conjoined daughters of the Hydra. Pearl is more aggressive and wants to be friends with the bullying Kala Mer'ri, while the more innocent Peri is dragged along. Eventually, Pearl realizes that they only need each other, and they become true friends with Kala once she reforms.
- Hazel and Hattie, of the Living Dead Dolls, are conjoined at the shoulder. Unfortunately for Hazel, Hattie is evil, and rose from the dead to kill her when she wanted to remain alive.
- The 1997 Blade Runner video game features Luther and Lance, conjoined twins who may or may not be replicants.
- House Of The Dead Overkill features conjoined twins Nigel and Sebastian as the boss of the 'Carny' level.
- Kingdom of Loathing has a Conjoined Zombie, which the game itself notes 1) Conjoined Twins are rare, 2) Conjoined Twins living to adulthood is even rarer, 3) the odds of them zombifying is even rarer than that, so this is probably the rarest thing in the world. As such, this is a Mini-Boss and not a regular Random Encounter.
- The Marcel-Moreso Brothers in Freaky Flyers, are not just conjoined twins (skinny twin growing out of pudgy twin's back), but they're also mimes. They toy with the idea of being surgically seperated (Which is shot down when the Narrator points out that they only have one pair of legs), and in the end, marry a woman with a split personality.
- The carnival sideshow in Bully features a pair of conjoined twin girls.
- BloodRayne features a pair of formerly conjoined identical twins as a boss. Althought they were seperated as children, they are still psychically joined and share each others' pain, so it is only necessary to attack one of them in order to kill them both.
- Batman: Arkham City features the Abramovici twins, who have recently surgically separated themselves due to political differences (one being a Communist and one being a Capitalist) and went to work as Elite Mooks for Joker and Penguin respectively.
- An Easter Egg near the end of the game reveals that they've patched up their differences, and want to be reattached.
- In the circus chapter of Sanitarium, the freakshow has two opposite-sex conjoined twins.
- Sam & Max Hit the Road has the Kuzzer brothers, carnival managers who are joined at the hip and facing away from each other. While talking to the protagonists, they sometimes have to twist around so that both brothers can have their say.
- In Baroque, the protagonist was once a conjoined twin, and the ghost he occasionally encounters in the Neuro Tower is that of his brother, who did not survive their separation.
- In Xenosaga: Episode II, it's revealed that Jr. and Albedo were once joined at the spine.
- Danny and Demi from The Outfoxies were conjoined before they were separated due to being hit by a train. They still do everything together - one holds the weapon and the other pulls the trigger.
- In Dishonored, according to the Heart, Custis and Morgan Pendleton were conjoined at the hand at birth (but were successfully separated).
- Terraria has a boss literally named "The Twins" that takes the form of two giant eyeballs. A band of flesh runs between them when they're close together, but this is purely cosmetic and they still have free movement.
- Fran Bow has Clara and Mia Buhalmet, a pair of conjoined twins who practice witchcraft and were apparently normal twins before they were sewn together.
- Pollux and Castor are this in God of War: Ascension. Castor, the majority of the body, is the physical fighter and hides his brother, Pollux, who acts as a sorcerer once he has to.
- In The Legend of Korra, Hundun wants revenge against the Avatar for injuries to his conjoined brother, who is connected to his back.
- CarnEvil features an enemy known as Flapjack, who happens to be a pair of freakish-looking conjoined twins connected to each other from the waist down.
- The titular characters from Ying & Yan are conjoined twins who are not fond of one another.
- Girl Genius: There's a story here... (first panel)
- In Jason Shiga's Demon, Hunter has a courtyard full of conjoined twins around his fortress as one of several means of keeping Jimmy from possessing his way in or Sweetpea from possessing her way out.
- Zeke Sr and Zeke Jr from Dead Ends.
- The short film Separation is a rather disturbing take on conjoined twins.
- This unofficial music video for Parov Stelar's song "The Mojo Radio Gang". In the video, the eponymous band includes a pair of conjoined twins (joined at torso), one of whom is a trumpeter, the other—a clarinetist.
- Deviantart naturally has many examples:http://www.deviantart.com/browse/all/?section=&global=1&q=conjoined+twins
- Hatchet Face from Worm is a fusion of two mostly-dead parahumans, Oni Lee and Hatchet Face.
- The twin sisters of the Baron Richmond in Twig don't initially appear to be this, until it's revealed there are actually two sets of twins, the younger ones living inside the older ones until they're let out to play.
- There was an episode of Courage the Cowardly Dog featuring Eliza and Liza Stitch, conjoined twin sisters with one body but two heads.
- CatDog starred conjoined twins of a cat and a dog.
- The Oblongs features Biff Oblong and Chip Oblong as conjoined twin brothers with a particularly odd variant of sharing a leg and butt cheek (giving them a grand total of 3 legs and 3 butt cheeks)
- To make things even more awkward than usual, Biff is gay and Chip is straight.
- The Simpsons:
- One "Treehouse of Horror" episode featured Bart's Evil Twin, Hugo, who had been separated from Bart at birth and kept in the attic. Hugo, having gone insane after being locked up in the attic his entire life, plans sew the two of them together again.
- In the Monorail episode, Homer fashioned a makeshift anchor out of the M on the train. He tosses it outside, and it drags on the road. At the same time, Dr. Hibbert is advising a pair of conjoined twins about the "very tricky procedure" that might allow him to separate them and then Homer goes by with the anchor, chopping them apart easily. The separated twins promptly high-five each other.
- The Ren & Stimpy Show featured one episode where the two of them suffer a terrible bus accident and have to undergo a drastic plan to survive: being sewn together into one body. Hilarity Ensues.
- One episode of The Powerpuff Girls had the three of them getting conjoined into one, all facing outward, with control of their limbs randomly shuffled. This was a plot by Mojo Jojo to ruin their ability to thwart him. This backfired when they discovered a super attack because of it and Mojo Jojo decided to seperate them than deal with even stronger PPG.
- May and June from the Batman: The Animated Series episode "Sideshow", two members of a group of retired freak-show circus performers.
- SpongeBob SquarePants features several examples of this.
- In The Sponge Bob Square Pants Movie, we meet a pair of conjoined fish in a bar.
- SpongeBob and Squidward have also been conjoined repeatedly:
- The particularly squicktastic episode "Squid Bob Tentacle Pants." Spongebob uses Sandy's teleportation device, then gets involuntarily teleported while Squidward has his arm in Spongebob's mouth. Squidward gets dragged through the teleportation device too, and when they arrive back at Sandy's Treedome, their bodies are joined together◊. Later, at the end of this episode, Spongebob, Squidward, and a bunch of other characters end up in one conjoined blob.
- The episode "Can You Spare A Dime?" features a brief moment of horror in which Spongebob tells Squidward, "We're like brothers...only closer." (This, incidentally, is also one of the page quotes.) Cut to Spongebob and Squidward fused together by a band of flesh◊. (WARNING! Not for the faint of heart.) Fortunately, Negative Continuity makes things better after the next cut.
- Zak and Wheezie the two-headed dragon from Dragon Tales are technically opposite-sex conjoined twins.
- Generator Rex has the breather episode Without A Paddle where Rex is convinced by Noah to join a Serious Business Ping-Pong tournament. The antagonists of that episode are their opponents from a rival school, an E.V.O that was a pair of twins, completely fused together but with two heads. The main problem was their overbearing father who pushed them (and juiced them) to win, which resulted in an Unstoppable Rage and Multiple arms
- Mighty Mac from Thomasthe Tank Engine, who is a double-ended Fairlie locomotive that has two faces on each side.
- The Camp Lazlo episode "Valentine's Day" features a pair of pigs joined by an eyeball, with 3 eyes between. They claim it's because they're made of magic. They fly away and leave a beautiful rainbow. Yeah.
- The school nurse on South Park has her dead conjoined twin still attached to her head.
- An episode of I Am Weasel took place in a "correctional facility". Several of the inmates were outfitted with massive iron devices that were meant to correct certain deformities. One of them had a "Fred" device on his backside that when removed, revealed a full twin somehow forced under it. Pretty morbid.
- In one Beavis And Butthead cartoon, our intrepid heroes wind up in the freak show of a traveling carnival as Siamese chicken-head-biting geeks by unspecified means, after their inexpert attempts to chat up a female contortionist draws the ire of their Ape Man. Stitches are mentioned.
- Kin and Kon Kujira of Grojband were born as Siamese twins, and they have the scars to prove it.
- Taken a step further considering that Kon has Kin's nipples on his back.
- In a cutaway on Family Guy they show a pair of conjoined twin brothers during the civil war who choose opposite sides. One shoots the other to death and apparently spends the rest of his life dragging around a skeleton. "I did not think this through."
- In Duckman, Duckman's two youngest sons Charles and Mambo are conjoined twins who are two heads sharing a body.
- The Rick and Morty episode "Interdimensional Cable 2: Tempting Fate" featured a pair of conjoined twins named Michael and Pichael who were literally joined at the hip. The former was a news anchor while the latter had his own cooking show.
- In Steven Universe, the Rutile twins are the Gem equivalent of this—their gems fused together while they were forming, resulting in two torsos growing from one pair of legs, with a Y-shaped gem on their stomach. They're thus considered defective by Homeworld and live hidden with similarly "undesirable" Gems.
- The Grim Adventures of Billy & Mandy had Hoss Delgado and Billy briefly encounter a pair of conjoined twin zombies in the episode "Brown Evil". Hoss separates them before hacking them into even smaller pieces.
- As mentioned above, Chang and Eng Bunker, the original "Siamese twins". They actually were from 'Siam' (now known as Thailand), and were connected at the sternum. In truth, Chang and Eng couldn't be separated; their autopsy revealed that they shared a liver, and they would have bled to death if the connection was cut. These guys toured around America and helped shape the popular notion about what a conjoined twin is, before settling down, marrying a set of sisters, and becoming slave owners. Seriously. Their sons fought in the The American Civil War. When Chang died in his sleep, Eng chose not to be separated from him, and followed him within three hours.
- George Schappell (born Dori) is a country music singer; he is also a conjoined twin, attached to his sister, Lori, at the head.
- Daisy and Violet Hilton who tried to make a living in films, and starred in the movie Freaks. Their life was one big Tear Jerker.
- Abigail and Brittany Hensel are conjoined twins, currently in college. Each woman has a separate head and heart, and controls one arm and leg on her side of their body. A segment on the Discovery Channel related the interesting level of cooperation required; growing up, the twins learned to walk, ride a bicycle, play sports, etc., and cooperate to drive a car — though they had to take the driving test twice, once for each of them.
- Turtles seem to have an unusually high rate of conjoined twins. Possibly they're simply more likely to survive being conjoined than most animals.
- There was a news article about Indonesian twins who had one body and two heads. They died shortly after, however.
- A pair of twins in Brazil were similar to this and the Hensel twins. However, they died at age 16 when one had a fatal lung infection; like with Eng Bunker, the healthy twin refused separation, even once it was clear that that was effectively a decision to die with her sister.
- The "navel" part of a navel orange is actually an incomplete "twin" orange attached to the complete orange. This part is usually bitter, and so usually discarded.