Sudden Anatomy

In a lot of comics and animation, the anatomy of living creatures tends to be simplified in a variety of ways. Some of these are common, such as people not having any discernible lips. Others are more unique to their artists, like how the children in South Park don't seem to have legs, just feet connected directly to their torso.

However sometimes the piece of anatomy that's usually missing becomes important to the story, and so a character will suddenly gain that piece of anatomy for exactly as long as they need it. For example, if characters in a series don't usually have lips, they'll suddenly sprout a pair if they need to kiss someone. Or, if they're normally drawn without eyebrows, but they're doing a Spock imitation, they'll suddenly grow some just for the Fascinating Eyebrow moment.

Depending on how entrenched the art style is in the audience's mind, this can seem rather jarring. And sometimes that's actually the desired effect.

Supertrope of Toothy Bird and No Mouth.

Examples:

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    Anime and Manga 

    Comic Books 
  • One comic issue featuring Donald Duck shows the characters experiencing a sound tremor that causes everything to vibrate, with one of the duck triplets making a comment going "If I had teeth, they would rattle". The interesting thing is that in that very panel, he does. And this is not uncommon - the Disney duck characters are drawn with teeth at many other occasions in the comics, usually gritting them or brushing them.
  • In the Fritz the Cat comics and both movies, Fritz (who wears no pants) is only... er, anatomically correct during sex scenes. The female characters, however always are.
  • The characters in Peanuts have stubby legs until/unless they have to crouch down, where they suddenly have legs that are about the right size for the rest of their bodies. Charles Schulz found he couldn't draw them with their regular sized legs while squatting.

    Film 
  • B.O.B. from Monsters vs. Aliens is able to grow arms when needed. Justified in that he's a Blob Monster.
  • Verne the turtle in the movie Over the Hedge mentions his tail a lot, and it's prefectly visible whenever he turns his back. Unless he loses his shell.
  • None of the characters from Sleeping Beauty have visible irises, but when Princess Aurora finally awakens from her deep sleep at the end of the film, her eyes actually turn dark blue but turn black again during the epilogue.
  • Throughout Pinocchio the titular character lacks teeth, however he does have them in three sequences the first time when he takes a bite out a pie while at Pleasure Island and the two times he brays like a donkey.

    Video Games 
  • The only time Guybrush Threepwood has appeared with five fingers was during the banjo duel with Van Helgen in The Curse of Monkey Island.
  • Most Sonic the Hedgehog characters seem to only have mouths when they're talking.
  • Some older Mortal Kombat fatalities invoke this trope (uppercutting someone's head off and continuing to uppercut more heads off the decapitated torso, multiple ribcages from exploded bodies, and so forth).
    • Same applies to most "more gore" mods in games of any genre, most notably applies to First Person Shooters.

    Web Animation 
  • The characters on Happy Tree Friends regularly go back and forth between having four-fingered hands and hands that look like oven mitts, even within an episode. They normally have featureless feet without toes, but Lumpy gained two large, hoof-like toes for one scene in "Every Litter Bit Hurts"...and then he was given three toes for a surfing scene in "Wipe Out".
  • Averted in Homestar Runner, where many characters have no visible arms. Rather than sprouting arms when necessary or being hindered by their character design, these characters Take a Third Option and seem to manipulate objects through telekinesis (though it's sometimes implied they simply have invisible arms).
  • Madness Combat gave an unfortunate Mook an ear just so the protagonist could rip it off.
  • The klaymen of Klay World, who often grow fingers just to point at or stroke each other, and don't talk with a mouth but grow one whenever they feel like chewing on something.
  • PONY.MOV: In SHED.MOV, Fluttershy was briefly seen with fingers so that she could snap them, and in MAGIC.MOV Twilight is seen actually sprouting a finger out of her hoof with which to press a button.
  • Characters in Bonus Stage will often be without arms in inaction scenes. Lampshaded at one point:
    Joel: I wish I had arms for this scene.
    His arms appear from the top of the screen.
    Joel: Oh, there they are! They descend and attach to his body

    Web Comics 

    Western Animation 
  • One episode of The Simpsons had a B-plot where Homer couldn't remember what color Marge's eyes were, and she refused to take off a pair of sunglasses until he could remember. However, since their eyes are always drawn as simply a black dot in the middle of a white orb, the audience had no clue what color Marge's eyes were either. At the very end of the episode, though, the camera zooms in on Marge's eyes to reveal a thin (and I mean very thin) hazel-colored iris. The idea here seems to have been, yes, Simpsons characters do have irises, it's just that they're so small we can't see them outside of an extreme closeup. In another episode, a boy hits on Lisa by calling her "Blue-Eyes".
    • The characters are not usually drawn with nails, but in "Trilogy Of Error", Homer's severed thumb has a fingernail on it. Plus, Homer's toenails are visible during an extreme closeup of his weight scale in "King Size Homer".
  • In The Grim Adventures of Billy & Mandy, Mandy is always drawn without a nose. Her lack of nose is even an important plot point in one episode. However, when Billy briefly takes over Mandy's body, he decides to pick her nose, and when he does nostrils suddenly appear on her face in order to allow it. Only the nostrils, though.
    • This is also the case when Mandy sniffs Billy's stink bomb in "The Really Odd Couple".
  • Looney Tunes
    • In "Rabbit of Seville", Bugs Bunny is drumming on Elmer's head as if playing a piano. A close-up shows that Bugs' normally Four-Fingered Hands now have five fingers, because the piano piece couldn't be shown accurately otherwise.
    • Gossamer's arms appear from and disappear into his body as needed.
    • In "High Diving Hare" after Yosemite Sam pushes Bugs off the diving board Bugs grows a pair of toe claws to catch onto the board, this is the first and only time we ever see them.
  • In the Dilbert TV series, characters that normally have No Mouth suddenly develop one whenever they need to say something, and it then disappears as soon as they stop. In the comic, Dilbert's mouth is only visible when he's gritting his teeth or shouting.
  • The Veggie Tales characters. It started out avoiding obvious manipulation of objects, but as time went on and available plots where this was still an option got used up, the animators started fudging. Especially amusing is the fact that in the opening, Larry still points out that he can't play the guitar because he doesn't have hands... and in the "Silly Songs With Larry" segment of Lord of the Beans, guess what we see him do.
    • They recently gave the opening sequence a major overhaul (new animation, new recording of the song) that finally takes out that joke.
    • See also the Flash-animated spinoff Larry-Boy series, where the animators came up with every excuse they could to let the characters physically manipulate things: Larry-Boy's utility belt has robot arms for every gadget, Professor Bok Choy wears a robe with empty sleeves to hold his pointer, various villains either have natural or technological arms, and a scientist was shown wearing a levitating "empty" glove.
    • Lampshaded in "Dr. Jiggle and Mr. Sly", with Scooter supposedly seeing hallucinations of hands and feet.
  • South Park
    • Most of the kids in only have eyebrows when making certain expressions such as anger or sadness. Most of the adults, however, always have visible eyebrows, as well as some additional facial features.
    • The kids have no visible fingers just thumbs usually, however whenever they need to emphasize something or hold on to something they have them. Most of them don't have ears or noses either but sometimes they appear suddenly when they use them only to disappear seconds later. For example, hey suddenly gain noses when they are shown pressing their faces up against the glass.
    • In "A Very Crappy Christmas", when Stan does an impression of Cartman, he suddenly has a double-chin just like Cartman has.
    • Stan was also noted to have blue eyes once, even though the characters usually don't have discernible irises.
    • When Kenny gets an eye pulled out by a turkey in "Starvin' Marvin", his eye is shown to have a visible blue iris.
    • Canadians have a whole different set of Missing/Sudden Anatomy.
  • The Powerpuff Girls:
    • In "Criss Cross Crisis", Buttercup, realizing she's in Professor Utonium's body, flexes the fingers on the Professor's hands (Buttercup's usual body has no fingers). In the accompanying closeup, Four-Fingered Hands is averted (like in the Bugs Bunny example above).
    • "Mr. Mojo's Rising" features a dramatic close up of the Professor's eyes as he's remembering when (Mojo) Jojo was his lab assistant and he suddenly has both irises and eyelashes.
  • In a Garfield TV special when the announcer says that a dog can play five instruments at once he grows an extra finger to emphasize this, the fifth finger disappears seconds later.
  • In Spongebob Squarepants it is often pointed out that Patrick doesn't have a nose. But, in "Wet Painters", after seeing Spongebob make a paintbrush with some nose hairs he suddenly gains a nostril and produces a giant mess of nose hairs. And, in "Battle of Bikini Bottom" he makes himself grow one in order to fling boogers at Spongebob. There's also Squidward, Patrick and Spongebob growing hair on more then one occasion. And of course, the infamous scene in the episode "House Fancy" where Squidward sudden gains a toenail which he accidentally removes. In the episode "Sailor Mouth," Spongebob counts the swear words on his fingers during Mr. Krabs' Cluster Bleep Bomb, announcing that Mr. Krabs' said all thirteen bad words, holding up his hands with a combined total of thirteen fingers. They go away after the gag is over. Patrick has also been capable of growing hair by sheer will.
  • In an episode of Camp Lazlo involving serial pantsing, the Long Pants the characters usually wore became well-defined shorts just seconds before they were pulled down.
  • Phineas and Ferb's Perry the Platypus only has teeth when he wants to bare them.
    • According to the "Learn to Draw Phineas and Ferb" book, Isabella has no eyebrows and is sensitive about it. Despite this, she is occasionally depicted with eyebrows.
  • One episode of CatDog played this for laughs by having Cat hold up seven fingers. The two would also constantly switch from having paws, when walking, to having hands for everything else.
  • On one episode of The Amazing World of Gumball, Richard is able to grow a moustache to make himself look tough.
    • When Gumball is listening to something across a room in "The Robot" he suddenly grows a large human-like ear on the side of his head and the cat ears he normally has on the back/top of his head disappear.
    • When he gets a perm in "The End", Gumball suddenly has blond head hair separate from his blue fur.
  • While not a human, Bender of Futurama tends to suddenly have plugs, switches, buttons and other devices on his body whenever a joke calls for it. Likewise both Zoidberg and Kif's bodies gain or lose abilities depending on the situation.
    • Lampshaded in the "Into The Wild Green Yonder" commentary - at a poker tournament, Leo Wong holds up five fingers to indicate Bender's five kings.
  • My Little Pony: Friendship Is Magic: Unlike the usual case, this is done constantly and subtly with eyebrows in the show, which for most characters only appear when an expression requires them.
    • In "Too Many Pinkie Pies" one of the Pinkie clones blows into her hoof and grows some fingers.
  • Frosty the Snowman has Four-Fingered Hands, but sprouts a fifth finger when he tries to count.
  • Done often in Adventure Time, usually with eyebrows in a wide range of styles or chin hair on Finn for humor/emotion. Marceline also picks her nose, once by growing one and another time with her apparently invisible one.
    • Finn usually has Four-Fingered Hands, but when a wizard is handing out power rings, he suddenly has extra fingers so he can wear ten of them.
  • Mr. Messy from The Mr. Men Show has arms that appear and disappear into his body if needed.
  • The lions of ''The Lion King' sprout and lose thumbs as needed.
  • Like The Lion King example, the puppies in 101 Dalmatians: The Series will gain thumbs when needed, though it seems to depend on the episode.
  • Snap from ChalkZone is usually drawn with Powerpuff Girl Hands, but the original eight shorts from Oh Yeah! Cartoons had him gain fingers and a thumb when needed. This stopped once the shorts became a full series, however there were a few episodes where it came up again.
  • The main duo from Hi Hi Puffy AmiYumi grow a fifth finger whenever is needed to make a joke work.