Crash is about people who are sexually aroused by car crashes. One female character has a scar on her leg that looks amazingly vaginal. No points for guessing what happens during one particular sex scene.
E Xisten Z. Imagine having gooey ports in your spine that tap into your nervous system to enable you to play virtual reality Video Games. Now imagine that the device you port into is a living thing with a pulse and vaguely resembles a brain. (It's also edible, but that's another trope...)
In a deleted scene from the remake of The Fly, Seth Brundle falls from the roof of his apartment building, and proceeds to grow a fifth limb, which he then proceeds to break and chew off. The severed limb then twitches for several minutes, clearly still "alive". Within the final cut, we have the almost cancerous growth of the mutant parts, pieces of him coming off, all those gooey fluids... Then there's the maggot dream. And the sequel is even worse.
Inverted in Eastern Promises by depicting a normal, human birth in the same lurid light.
Some of the weirder scenes of his Naked Lunch movie edge into this ("Did I ever tell you about the man who taught his asshole to talk?"), but it's actually toned down from the book, where junkies deliberately allow their open wounds to fester so they can just put the heroin in with an eye-dropper.
The Antichrist depicts themes of body/self hatred/fear, mutilation, and fear of human nature.
The Guinea Pig series, in particular: Mermaid in a Manhole, where a man finds an injured mermaid in a sewer, takes her home with him, only for her to become horribly ill.
May depicts a young socially isolated woman develop a morbid fascination with other people's body parts...
The famous chestburster scene in the first film (parodied in Spaceballs). The original concept of the Alien lifecycle (which appears in the Director's Cut of Alien, but is non-canonic since it contradicts Aliens) involved capturing victims and turning them into new facehugger eggs.
In Alien: Resurrection, Ripley's cloning process went wrong many times before, creating diseased and barely functioning human-alien hybrids. The opening title sequence shows some of them in extreme closeup.
The 2012 prequel Prometheus creates a whole new variety of body horror with Freudian symbolism: The "Space Jockeys" from the original film created a black substance that causes severe mutations when ingested. One character starts to physically decay, his skin turning charred-black. Before that can happen, he has sex with his (infertile) girlfriend, who gives birth to a squid monster the following day. In the end of the movie, the squid monster captures the last remaining Space Jockey alive and uses its body to spawn something that looks like a more primitive version of the series' iconic monster.
American Mary features a dark slasher vibe of surgery called body modification. The title character at one point uses this surgery to make a stripper into a human doll so she won't be sexualized and later, uses said surgery to get revenge on her rapist.
The creation of "Evil Ash". It begins with an eye appearing on Ash's shoulder and progressing to a head, torso, and finally a separate body. That scene was scarier than most of the zombies! Bonus Nightmare Retardant when Evil Ash is knocked out and buried, although the beheading that ensues between those sequences are still scary.
In the comic Freddy VS Jason VS Ash, Ash has a nightmare echoing the events from Evil Dead 2 except his bad hand sprouts metal claws from the fingertips, his fingernails being forced out of the way by the claws being drawn with loving, gory detail.
The Manster is the source for Army of Darkness's Evil Ash transformation idea. A slower transformation with lots of creepy goodness as the victim copes with different stages.
The Basket Case films, particularly the second, played this for squicky laughs.
Also from the same director Brain Damage is full of body horror.
Black Sheep (not to be confused with the Chris Farley movie of the same name) pays homage to An American Werewolf in London when the farmer turns into a weresheep. The company behind this movie is also in talks to do an American Werewolf remake.
In Blessed, Heather Graham is impregnated with twin antichrists.
Charlie and the Chocolate Factory has Violet come out looking all floppy and blue-skinned (as a result of being turned into a giant blueberry and de-juiced). She doesn't seem to mind that she's more flexible than before, though.
Bug and the stage play of the same name it is based on could be seen as a Deconstruction of body horror. The two leads become convinced they are playing host to billions upon billions of genetically engineered carnivorous aphids, but who knows if it's actually happening or it's just a shared delusion?
Osmar in Damnatus, after being Mind Raped by a daemon. The fact that his stammered prayers start manifesting Voice of the Legion is the first bad sign. He primes a grenade to commit suicide, but before it goes off there is a brief shot of him collapsing and starting to grow tentacles.
District 9: After accidentally spraying himself with an alien substance, Wikus experiences increasingly disturbing kinds of this. First, he only experiences a nosebleed but of black blood, which is immediately dwarfed by his fingernailsfalling off. After vomiting black goo and passing out at a party, he goes to a hospital, where a doctor removes the bandages on his arm to discover that it has outright mutated into that of a prawn's, and Wikus is absolutely terrified. To make it worse, in reaction to what's happening to him and going slowly insane, Wikus decides to take matter in his own hands and chops off a finger of the new arm, presumably with the intention of eventually removing all of it. Apparently, the pain makes him come back to his senses.
A theme in Eraserhead. It starts with Bill complaining about problems in his knees and wrists, and then moves up to the creepy "manmade" chickens, and we end up with The Lady in the Radiator's horrifically distended cheekbones, the burnt skin of The Man in the Planet, and The Baby. There's also a certain Squick factor to realizing a human being was pregnant with that thing.
In the first Fantastic Four movie, Victor von Doom gets a shard of irradiated metal stuck in him, which causes his entire body to gradually turn into metal. Kind of done with Ben Grimm becoming the Thing, too, as well as Johnny becoming the Human Torch while snowboarding. "Johnny! You're on fire! ... No, you're ON FIRE!"
Bruce's transformation in the 2008 Hulk movie is horrific. Looking closely at the scene in the university lab with the induced transformation, it looks as if his bones start growing to Hulk-size before the rest of his tissues.
In this film, the Abomination lives up to his name. Bruce at least manages to keep his bones in his skin, whereas the Abomination has several of them exposed, including a good portion of his ribcage.
Indiana Jones and the Temple of Doom one of the slaves gets his heart visibly and physically ripped cleanly out his chest by Mola Ram...the horror doesn't stop there. The slave is still alive (somehow), and the heart is still indirectly "connected" to his body, as it continues to beat, and when the slave is sacrificed to a lava pit, the heart beats rapidly as the slave is horrified with fear, and the heart then burns to bits as the slave falls into the pit and burns.
Mum & Dad. Disturbing torture all over the place. To scratch the surface, a girl is put in a suitcase which is then hit repeatedly with a hammer. There's also a crucified man hanging on the kitchen wall.
Mr. Creosote in Monty Python's The Meaning of Life probably counts. Swelling and bursting because of one last wafer thin mint, showering everything with the contents of the stomach and, because it was so explosive, having the entire front of his body blown off, leaving only a pair of lungs and a beating heart.
The New Adventures of Pinocchio had Pinocchio (then a real boy) turn back into a puppet after signing a contract - and Gepetto became a puppet as well. The end of the movie has The Showmaster turning into a sea monster.
In Disney's Pinocchio the scene where Pinocchio and Lampwick are transformed into donkeys is especially shocking for its day and age. At least one analysis of Disney films revealed that Disney was specifically going for a horror film approach along the lines of Jekyll and Hyde.
Nightbreed featured a litany of Body Horrors among the "monster" community, extreme enough to make Boone's excruciating transformation seem mild. Not directed by David Cronenberg, but he played the perfectly normal yet perfectly creepy villain, fighting the relatively sympathetic monsters. All this is hardly surprising, considering that the movie is based on a book by Clive Barker.
Poltergeist has a scene where a guy is in the bathroom washing his hands and he suddenly starts bleeding and has a horrific vision of his face peeling off. In the sequel, there's a sequence where another guy downs a bottle of tequila; upon swallowing the worm, he becomes a Meat Puppet for the Big Bad. After he's been forced to abuse his family for a while, he then proceeds to vomit a large, tumorous worm-like THING that morphs into said big bad. Yeesh.
Parodied in Casper, when Bill Pullman's character is possessed by Casper's three kooky uncles and turns into Clint Eastwood, Rodney Dangerfield, Mel Gibson, and The Crypt Keeper.
Also parodied in the Family Guy episode "Petergeist", in which Peter peels off his face to become... Hank Hill.
Silent Hill has more than its share; the nurse near the end, the barb-wire dildo finale, the white things that spat acid, and when Pyramid Head rips the skin from a woman's body...while she's still alive!
Slither loves this trope so much it wants to impregnate it with thousands of alien slugs causing it to swell up until it could fill a barn, and then instead of giving birth the traditional way, simply explode. The alien slug babies will then run off and crawl into the brains of anyone they can find to make them join the hive mind (probably a Shivers reference). The "queen" now resembles a cross between a squid, Michael Rooker, and a horrible skin disease, and is spread across a room. The alien slug baby people can then strip off and lie down on their ruler, and slowly get absorbed into him.
The ending of Society is a particularly bizarre example of this trope. Anybody who has seen the film will probably have the "shunting" scene burned into their brain, either because it is disgusting and disturbing, or unbelievably Narmy (in a ptpt╠inducing sort of way). (You know Hieronymous Bosch's ''The Garden of Earthly Delights?'' Now imagine that was drawn from life.)
Splinter (2008) has some good malformy body horror in it.
In Star Trek: First Contactone of the Borg drones that infiltrated the Enterprise initiates one of the crew into the assimilation process. We see black veins showing up along half of his face as he begs Captain Picard for help. Picard puts him out of his misery. Early in the film, Picard has a nightmare that involves a Borg prosthesis bursting out of his face.
Way back in Star Trek: The Motion Picture, an early scene sees the Enterprise's new science officer and another crewman caught in the transporter beam when it malfunctions, resulting in their twisted and deformed bodies appearing for a moment, screaming horribly and then vanishing — apparently reappearing on the other end of the beam, where they (fortunately) didn't live long.
in Star WarsRevenge of the Sith there's both Obi-Wan ripping open Grievous' chestplate, exposing all his organs, then shooting them with a blaster and making his insides explode and also Vader, after being burnt alive and losing most of his limbs, climbing up the embankment with his robot arm.
John Carpenter's version of The Thing is famous for having some of the most gruesome and disturbing transformation scenes in cinematic history, combined with a subtler level of Paranoia Fuel.
The 2011 prequel tried to do the same, but a lot of the horror is lost when it's CGI.
Thinner involves a very fat man rapidly losing weight due to a curse. Also contains a man who turns into a bipedal lizard (complete with scales and webbed fingers), and another who develops rotting pits on his face.
Tokyo Gore Police. Imagine the two Tetsuo movies with pink flesh instead of metal, then add a ridiculous amount of Gorn.
Batman & Robin featured a painful transformation scene of the villain Bane, who grows ungodly huge muscles by having "Gatorade" pumped directly into his skull. This was intended as a family-friendly film.
The demise of Captain Amazing in Mystery Men as well as the demise of millionaire supervillain Casanova Frankenstein.
The Hunger has David Bowie play a vampire who starts losing his immortality and starts aging during the middle of the film. He doesn't lose his immortality, just his youth. Catherine Deneuve has a dozen former vampire lovers tucked away in coffins in one room of her apartment, all of them extremely old and doomed to live as withered ancients forever. And a flashback suggests at least one of them has been that way since ancient Egypt. Gulp.
In The Shining, there is a scene where Jack Torrence walks into the bathroom of the hotel and finds a rather attractive looking naked woman in the tub, the woman comes out of the tub and she and Jack embrace — but as he's kissing her, the woman slowly turns into the rotting corpse of the much older woman who died in the tub. And then she starts laughing, taking it to higher levels of creepiness.
In Monkeybone, before the end credits there's an animated segment where various characters from the film appear in toon form and take off their skins and bodysuits to reveal monkey-like characters underneath. Considering the director, Henry Selick, also made The Nightmare Before Christmas, not that surprising.
In the first two X-Men movies, bits and pieces of Wolverine's surgery are shown. The way it occurs in X-Men Origins: Wolverine isn't very scary (except if needles frighten you. There are a lot, injecting really deep). But Weapon XI's mouthless face compensates.
Hank McCoy gets his turn in X-Men: First Class. His transformation involves him gasping and struggling with his limbs as they turn blue and furry and all mutated.
The Saw films not only expose the viewer to considerable machine-assisted Body Horror, but Jigsaw's captives are forced to overcome their own dread of bodily mutilation in order to survive.
The French-Japanese-Korean film Tokyo! features a young woman slowly turning into a chair. It starts with a huge gaping hole in her abdomen, then later she is shown struggling to walk with her legs turned into wooden chair legs and her pelvis into a wooden seat. Finally, her hands also become chair legs and her head DISAPPEARS. The kicker? In the original comic book the movie is based on, the transformation is played for laughs.
The 1988 film Willow. The climactic battle lingers on the main characters undergoing a slow, painful transformation into pigs, while the evil queen taunts them. The scene where the Troll falls to the ground, rolls into a ball, has tentacles tear its pelt off, revealing brown slimy pulsating muscle, and then two little dragon heads emerge is rather... gruesome. Willow's repeated attempts to return Razel to human form are implied to not be pleasant experiences for her, either.
The scene where Bavmorda pulls a Baleful Polymorph to transform Airc's entire army into pigs is incredibly disturbing, especially because the visual effects and makeup used still hold up.
Guyver: The first transformation sequence. Right before the big bad shows up when the guy they are trying to rescue... well, it doesn't turn out so well for him. Painful Transformation doesn't even begin to describe it. What happens to one of the Zoanoids, who accidentally swallowed the Guyver after the heroes Disney Death. The other villains were planning to cut him open and get it back, before it went Chest Burster instead.
Ginger Snaps tells a lycanthropy-as-a-metaphor-for-puberty story of a teenaged girl who is bitten by a werewolf, and subsequently begins a slow transformation into a wolf. In one memorable scene, she attempts to cut off her own tail (which, at that point, is hairless and half-developed) with a kitchen knife.
Poultrygeist and its demon chicken egg breasts. There was a man with eggs where his nipples should be with demon chickens hatching from them. This is on top of normal zombie movie body horrors (only with chicken human zombie hybrids).
Dr. Jekyll's very painful transformation to Mr. Hyde in The Pagemaster traumatized many children who saw this film. If the creepy, dark visuals aren't enough to scare you out of your mind, we also hear Jekyll screaming in agony and gasping for breath during the change. And then there's his Mr. Hyde form, which is scarier than those all put together!
In the 90's classic Little Monsters, you can go to the "monster world" by use of portals under the bed. If you stay there long enough, you become a monster. Apparently, if you piss off Boy (the boss), his minion invokes a punishment that RIPS YOUR HEAD OFF AND PUTS IT IN A BASKET. He'll replace your headless corpse with a fake head, though. And apparently this does not kill you.
In Terminator Salvation, Marcus Wright's discovery that he is a cyborg by looking down and finding his chest cavity ripped open and filled with metal bits is pretty disturbing.
Ame No Tori (The Vanished) - based on a short story written by Hideyuki Kikuchi involving (undead?) children and a Town with a Dark Secret. A freelance writer for a lowbrow tabloid magazine visits a local town to investigate the mysterious case of a dead child whose internal organs are completely missing. While he is interviewing a doctor in the town morgue, the dead child suddenly jumps off the stretcher and runs away!
Curse II: The Bite (an in-name-only sequel to The Curse, a movie loosely based on Lovecraft's The Colour out of Space) features a man bitten on the left hand by a snake, one implied to have been exposed to radioactive waste. At first, he just experiences some weakness and vomiting, but then his personality starts getting colder. When we see that his hand has mutated into a snake's head, and it kills two people (one by jamming itself down a police deputy's mouth & throat and tearing out his heart, the other by tearing a nurse's jaw off), he freaks out and chops it off. But it doesn't stop there — another snake grows out of the stump and strangles a man with its super-long tongue (frog-snake?), then as he chases his girlfriend snakes begin bursting out of him. His left eye pops out, and snakes wriggle out of it as if it were some sort of egg. His tongue elongates and detaches, and wriggles after her. He vomits up three or four large snakes, before his mouth opens so wide his head splits in half and a giant snake (which appears to have his spinal column for a body) pops out and chases after the girl. Earlier, we see hints of the transformation trauma to come, in the form of a dog which had been bitten and mutated into a snake-dog hybrid.
Makeup effects were done by Screaming Mad George, who also did the makeup effects for The Guyver, A Nightmare on Elm Street 4, Re-Animator II/Bride of Re-Animator, Society, and Wishmaster. They know Body Horror.
Dagon (2001): The denizens of the town Imboca have overthrown Christianity in favour of the fish god Dagon, who has brought them wealth from the sea in the form of fish and gold. Since that time, they have mutated into fish-like forms and are obedient to the beautiful, mermaid-like UxÝa.
Burning Godzilla in the film Godzilla vs. Destoroyah. His body is overheating from going into a meltdown from nuclear overload to the point where his flesh is now melting off of his body. Even worse when he dies. He actually cries in agony because he's in so much pain.
The Heisei incarnation of King Ghidorah falls under this. Imagine being three cute little pets created to be friendly companions being mutated and fused-together into a single three-headed dragon.
Death Becomes Her: If it wasn't so funny it could be Un Example. Just imagine that you can live forever, but you're not breathing, your heart's not beating and all of your traumas remain until you fix them artificially. As well as skin color and eyes.
The Last Circus has one character mutilate his face with caustic soda and an iron to mimic a clown's makeup.
Cabin Fever centers around a group of friends who go camping and contract necrotizing fasciitis... also known as flesh-eating bacteria. Bloodiness certainly ensues. Its sequel takes this several steps further into Happy Tree Friends territory.
Iron Man: For your consideration: imagine being blown up by your own missile on the other side of the world. You wake up in an unfamiliar place, with a tube shoved up your nose. You reach over to get some water, when suddenly, you feel something pull on your chest. That something is a pair of battery cords. With growing terror, you realize that a freakin' electromagnet has been installed in your chest. Permanently. The kicker? It's the only thing keeping you from dying a slow, painful death due to the METAL SHARDS SLOWLY WORKING THEIR WAY INTO YOUR HEART. Have fun trying to live with that. As if that wasn't enough, you later find out the Mini Arc Reactor you employed as a replacement is burning Palladium into your FLESH and BLOODSTREAM. The very thing keeping you alive is also killing you. And people wonder why Tony Stark has a drinking problem.
Extremis-enhanced individuals in Iron Man 3 certainly qualify. Extremis causes your body temperature to spike at 3000 degrees when using the enhancements, leading to all sorts of fun effects from Glowing Eyes of Doom to lighting up your entire body. Oh, and Extremis will cause body parts to regenerate (painfully, judging by the reactions), even if you're burned to a crisp in an explosion. And that doesn't even touch on those whose bodies reject Extremis and become human bombs...
From the first movie, Yinsen describes that the condition Tony is in is called the Walking Death because of both the horrible stuff described above, and because even if they manage to survive like Tony, eventually their battery would give out and they would die anyways. They're living on borrowed time and Tony only escaped this fate because of the Arc Reactor.
Future Seth Richards in Looper tries to make his escape until parts of him start to disappear, because the men holding his past self captive have started to mutilate him. It starts with his fingers... then his nose... then his legs...
In We Were Soldiers, based on the battle of Ia Drang valley in 1965, napalm is accidentally sent to land on American soldiers. Besides the men running while on fire, a young soldier named Jimmy Nakayama had his legs burned by the napalm. The horror comes from when one man grabs his ankles to carry him to the rescue chopper and the skin slides off like the burned outside of a marshmallow.
After Earth: The slug-like creature that bites Kitai and causes a gruesome infection.
The original RoboCop (1987) movie had a moment where a mook trying to run Murphy over with a truck accidentally drives straight into a huge vat of Toxic Waste. He emerges from the deluge horribly melted and deformed, and is so biologically and chemically unstable that getting hit by a car pops him like a zit. See a compilation of it here, at your own risk.
Robo himself, under his cool visor, is actually a human face (or tauntingly realistic replica of one) stretched over and nailed onto the metal shell of his head.
Knifehead and Scunner from Pacific Rim, each have a pair of arms that look as if the bones in them are splitting apart.
As well as the injuries the Kaiju suffer. For instance, Leatherback gets it's arm shot off by GipsyDanger. Then when they check for a pulse, they fire at it, igniting it's organs and causing it's ribcage to collapse.