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* ''Film/BodyBags'': The "Hair" segment features a balding middle-aged guy who receives a mystery treatment from a strange health care society. He grows a giant mane of hair overnight, but the hair just keeps growing all over his body, ''including on his teeth''. It turns out that [[spoiler:the "hairs" are actually parasitic wormlike aliens who need human brains for food and it's already too late for him.]]
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* In KevinJAnderson's ''Dan Shamble'' novel ''Hair Raising'', a mad scientist attempts to develop a cosmetic formula that would cause instantaneous hair growth. He eventually succeeds, [[spoiler: but only by using the stolen scalps of werewolves to create it. [[GoneHorriblyRight Then it works ''too'' well,]] and fills his house with hair when some of his invention drips into a clogged-up shower drain.]]
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* In KevinJAnderson's Creator/KevinJAnderson's ''Dan Shamble'' novel ''Hair Raising'', a mad scientist attempts to develop a cosmetic formula that would cause instantaneous hair growth. He eventually succeeds, [[spoiler: but only by using the stolen scalps of werewolves to create it. [[GoneHorriblyRight Then it works ''too'' well,]] and fills his house with hair when some of his invention drips into a clogged-up shower drain.]]
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* In ''Literature/TheFolkKeeper'', one of Corinna's magical traits is that her hair grows two inches per night. She constantly trims it, both to prevent anyone learning about her magic and to [[SweetPollyOliver disguise herself as a boy]].
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* In GirlGenius, Agatha has hair growth troubles over [[http://www.girlgeniusonline.com/comic.php?date=20131023 this and the following page]].
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Deleted link to unviewable Private video.
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* ''Film/IndianaJonesAndTheLastCrusade''. The BigBad drinks from a false Holy Grail and suffers from RapidAging, including having the hair on his head grow very quickly. Watch it [[http://www.youtube.com/watch?v=-DGFuHC75aY here]].
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* ''Film/IndianaJonesAndTheLastCrusade''. The BigBad drinks from a false Holy Grail and suffers from RapidAging, including having the hair on his head grow very quickly. Watch it [[http://www.youtube.com/watch?v=-DGFuHC75aY here]].
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* ''Manga/PingPong'': Applies to any character when they leave their team.
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* This is the case of Millia Rage's hair in GuiltyGear, being alive and prehensile as well. Some of her attacks make her hair grow by necessity.
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* This is the case of Millia Rage's hair in GuiltyGear, VideoGame/GuiltyGear, being alive and prehensile as well. Some of her attacks make her hair grow by necessity.
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* The royal line of Idris in ''Literature/{{Warbreaker}}'' can grow their hair out effectively instantly, as well as being able to change its color. This does make them very hungry, though.
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* In YuYuHakusho, whhen [[spoiler: Yusuke's demon heritage is awakened by Raizen]] in the Sensui arc, his normally short hair grows to feet length levels from one minute to another. [[spoiler: This doesn't last, as he asks Kurama to cut if off.]]
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* Happens to Usagi in the SailorMoon manga. Her hair is already RapunzelHair levels of long, but after she's revealed to be the Moon Princess, it begins to grow several feet long in few hours and she has to lock herself in her room to hack it off constantly until the effect disappears.
* In YuYuHakusho, whhen [[spoiler: Yusuke's demon heritage is awakened by Raizen]] in the Sensui arc, his normally short hair grows to feet length levels from one minute to another. [[spoiler: This doesn't last, as he asks Kurama to cut if off.]]
* In YuYuHakusho, whhen [[spoiler: Yusuke's demon heritage is awakened by Raizen]] in the Sensui arc, his normally short hair grows to feet length levels from one minute to another. [[spoiler: This doesn't last, as he asks Kurama to cut if off.]]
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* The main plot of ComicBook/TheGiganticBeardThatWasEvil is about a beard that won't stop growing and won't stay trimmed.
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* In a ''Webcomic/SchlockMercenary'' arc where Elf goes on a makeover reality show (so the company can blow it up) they use some nanites to make her "crew-mullet" grow into something a lot longer. She keeps some of the extra length.
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* In one ''Literature/{{Goosebumps}}'' book, the protagonist begins growing hair on his hands and face that keeps coming back no matter how often he shaves it off. He thinks at first that it's being caused by a strange sunscreen solution that he and his friends tried out, but it turns out that [[spoiler:it's a sign that he and his friends are reverting back to their original dog forms]].
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[[AC: {{Film}}]]
* ''Film/ThePeanutButterSolution'': when the main character loses all of his hair by seeing ghosts, the ghosts teach him to make a magical paste that causes his hair to grow back at a supernatural rate. He eventually discovers that his new hair can be used to make magical paintbrushes. It's the same old story.
* ''Film/ThePeanutButterSolution'': when the main character loses all of his hair by seeing ghosts, the ghosts teach him to make a magical paste that causes his hair to grow back at a supernatural rate. He eventually discovers that his new hair can be used to make magical paintbrushes. It's the same old story.
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https://iq5wtw-sn3301.files.1drv.com/y2p48IChVF5y-fdRzdNkEoik5Lluq_A2z2FDJH2hnIhd4xAeSsauT6c7zmdt6Cje5lMRscu1bJacRKUg9n6aNjwwmJrO16ibEZEZ783UeDpoj8/land%20of%20black%20gold.PNG]]]]
[[This is what happens when you pick up strange drugs in the dessert]]
[[This is what happens when you pick up strange drugs in the dessert]]
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[[This is what happens when you pick up strange drugs in the dessert]]
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https://iq5wtw-sn3301.files.1drv.com/y2p48IChVF5y-fdRzdNkEoik5Lluq_A2z2FDJH2hnIhd4xAeSsauT6c7zmdt6Cje5lMRscu1bJacRKUg9n6aNjwwmJrO16ibEZEZ783UeDpoj8/land%20of%20black%20gold.PNG]]Tintin]]
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https://iq5wtw-sn3301.files.1drv.com/y2p48IChVF5y-fdRzdNkEoik5Lluq_A2z2FDJH2hnIhd4xAeSsauT6c7zmdt6Cje5lMRscu1bJacRKUg9n6aNjwwmJrO16ibEZEZ783UeDpoj8/land%20of%20black%20gold.PNG]]Tintin]]PNG]]]]
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https://iq5wtw-sn3301.files.1drv.com/y2p48IChVF5y-fdRzdNkEoik5Lluq_A2z2FDJH2hnIhd4xAeSsauT6c7zmdt6Cje5lMRscu1bJacRKUg9n6aNjwwmJrO16ibEZEZ783UeDpoj8/land%20of%20black%20gold.PNG]]Tintin]]
[[This is what happens when you pick up strange drugs in the dessert]]
[[This is what happens when you pick up strange drugs in the dessert]]
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* Mr. Barkin's beard in ''WesternAnimation/KimPossible'' apparently grows so fast that he has to shave it 15 times a day.
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* Mr. Barkin's beard in ''WesternAnimation/KimPossible'' apparently grows so fast that he has to shave it 15 times a day.
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\"A Glitch is a Glitch\" is non-canon.
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* {{Averted|Trope}} and played straight in ''WesternAnimation/AdventureTime''. In "To Cut A Woman's Hair", after Finn learns that he doesn't specifically need princess hair to save Jake from a witch, he cuts off his RapunzelHair (which, incidentally, was revealed for the first time in the series). From then on, whenever his hair is depicted, it shown being slightly longer than the last time it was last seen. Then in "Davey" (which was three seasons later), he cuts it again to adopt a disguise. By "A Glitch is a Glitch" (which was only a few episodes later), his hair's back to the sheer length it was when it was first revealed.
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* In the beginning of ''Disney/ThePrincessAndTheFrog'', we see [[BigBad Facilier]] offer a bald man a voodoo hair tonic; it regrows his hair, then promptly causes hair to sprout all over his face and hands as well, making him look like a werewolf.
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Hair does take a while to grow out. Using miracle products might do the trick. But in fiction, it does happen.
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Hair does take normally takes a while to grow out. Using miracle hair growth products might do the trick. But may help some, but in fiction, it does happen.
the only limit to how fast hair can grow is how realistic the show wants to be.
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That\'s not two ways....
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This trope can happen in 2 ways: Either there's a product that instantly grows hair, or any other way.
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* CharlieAndTheChocolateFactory features Hair Toffee. It makes hair grow on your head , which is perfect for bald people... except the last Oompa-Loompa to test it wound up with hair that grows over ''a foot'' per day, '''constantly'''.
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* CharlieAndTheChocolateFactory ''Literature/CharlieAndTheChocolateFactory'' features Hair Toffee. It makes hair grow on your head , (plus a mustache and a beard), which is perfect for bald people... except people...but at the last moment it's too powerful. The Oompa-Loompa to test who tested it wound up with hair that grows over ''a foot'' per day, '''constantly'''.
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* HeavenlyNostrils: The [[http://www.gocomics.com/heavenly-nostrils/2012/07/16 July 16, 2012]] strip shows how beholding the glory of Marigold can undo baldheadedness for Dakota.
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* HeavenlyNostrils: The [[http://www.gocomics.com/heavenly-nostrils/2012/07/16 July 16, 2012]] strip shows how beholding the glory of Marigold can undo baldheadedness for Dakota.
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* Iwai from ''Manga/ThSeveringCrimeEdge'', has a curse places on her lineage causing all the females' hair to grow down to their ankles at midnight.
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* Iwai from ''Manga/ThSeveringCrimeEdge'', ''Manga/TheSeveringCrimeEdge'', has a curse places on her lineage causing all the females' hair to grow down to their ankles at midnight.
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* Iwai from ''Manga/DansaiBunriNoCrimeEdge'', has a curse places on her lineage causing all the females' hair to grow down to their ankles at midnight.
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* Iwai from ''Manga/DansaiBunriNoCrimeEdge'', ''Manga/ThSeveringCrimeEdge'', has a curse places on her lineage causing all the females' hair to grow down to their ankles at midnight.
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* In ''Literature/HarryPotter'' at one point during his childhood, Harry's aunt cut off his bangs so his scar showed. It magically grew back shortly after. Justified because ,well, AWizardDidIt (albeit unknowingly).
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* In ''Literature/HarryPotter'' at one point during his childhood, Harry's aunt cut off his bangs so bangs, almost shaving him except for the part that hides his scar showed. scar. It looked ridiculous, but magically grew back shortly after. before Harry's next school day. Justified because ,well, because, well, AWizardDidIt (albeit unknowingly).
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* In an ''{{ComicBook/Asterix}}'' comic, Getafix creates a potion to restore lost hair, selling it to the Romans who have captured him as the Magic Potion for strength. An entire roman camp - and a small dog licking up the dregs - becomes excessively unmilitary, thus presenting a slovenly appearance to Caesar when he pulls a surprise inspection.
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* In an the first ''{{ComicBook/Asterix}}'' comic, Getafix creates a potion to restore lost hair, selling it to the Romans who have captured him as the Magic Potion for strength. An entire roman camp - and a small dog licking up the dregs - becomes excessively unmilitary, thus presenting a slovenly appearance to Caesar when he pulls a surprise inspection.
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[[AC:VideoGames]]
* One of the hilarious potion recipes in ''VideoGame/PajamaSam: No Need to Hide When It's Dark Outside'' promised that it would grow out hair. When Same tries it, he first grows out locks that reach the floor, quickly grow longer than he is, and then escalates until he is completely wrapped in hair, gets angry and chases the resultant giant hairball away.
* One of the hilarious potion recipes in ''VideoGame/PajamaSam: No Need to Hide When It's Dark Outside'' promised that it would grow out hair. When Same tries it, he first grows out locks that reach the floor, quickly grow longer than he is, and then escalates until he is completely wrapped in hair, gets angry and chases the resultant giant hairball away.
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* In the TinTin comic book "Land of Black Gold", Thomson and Thompson find tablets and swallow them, thinking them to be aspirin, causing them to belch continuously, and grow long hair and beards that change colour. The beards grow so fast that they have to be cut multiple times each day.
* In ''AsterixAndCleopatra'', the henchman of the villain Artifis vows never to shave his head again until the pesky Gauls are killed. The rate at which his shaven skull becomes extremely hirsute then becomes a running gag. In another Asterix comic, Getafix creates a potion to restore lost hair, selling it to the Romans who have captured him as the Magic Potion for strength. An entire roman camp - and a small dog licking up the dregs - becomes excessively unmilitary, thus preventing a slovenly appearance to Caesar when he pulls a surprise inspection.
* In ''AsterixAndCleopatra'', the henchman of the villain Artifis vows never to shave his head again until the pesky Gauls are killed. The rate at which his shaven skull becomes extremely hirsute then becomes a running gag. In another Asterix comic, Getafix creates a potion to restore lost hair, selling it to the Romans who have captured him as the Magic Potion for strength. An entire roman camp - and a small dog licking up the dregs - becomes excessively unmilitary, thus preventing a slovenly appearance to Caesar when he pulls a surprise inspection.
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* In the TinTin Franchise/{{Tintin}} comic book "Land ''Land of Black Gold", Gold'', Thomson and Thompson find tablets and swallow them, thinking them to be aspirin, causing them to belch continuously, and grow long hair and beards that change colour. The beards grow so fast that they have to be cut multiple times each day.
* In''AsterixAndCleopatra'', the henchman of the villain Artifis vows never to shave his head again until the pesky Gauls are killed. The rate at which his shaven skull becomes extremely hirsute then becomes a running gag. In another Asterix an ''{{ComicBook/Asterix}}'' comic, Getafix creates a potion to restore lost hair, selling it to the Romans who have captured him as the Magic Potion for strength. An entire roman camp - and a small dog licking up the dregs - becomes excessively unmilitary, thus preventing presenting a slovenly appearance to Caesar when he pulls a surprise inspection.
* In
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* In ''AsterixAndCleopatra'', the henchman of the villain Artifis vows never to shave his head again until the pesky Gauls are killed. The rate at which his shaven skull becomes extremely hirsute then becomes a running gag.
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* In the comedic fairy tale ''Literature/{{Melisande}}'', a princess's attempt to wish for long, beautiful hair results in hair that grows rapidly and increases its rate of growth whenever it's cut.
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* Indexes: HairTropes, ImprobableAppearanceTropes
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Subtrope of ArtisticLicenseBiology. Inversion of HairTodayGoneTomorrow. Expect StatusQuoIsGod if this doesn't stick. RapunzelHair is a SisterTrope and a possible result. See HairReboot when the hair returns to its original form instantly. PowerMakesYourHairGrow is a type 2 subtrope. If the color's unnatural, it's YouGottaHaveBlueHair. A possible property of MagicHair.
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Subtrope of ArtisticLicenseBiology. Inversion of HairTodayGoneTomorrow. Expect StatusQuoIsGod if this doesn't stick. RapunzelHair is a SisterTrope and a possible result. See HairReboot when the hair returns to its original form instantly. PowerMakesYourHairGrow is a type 2 subtrope.subtrope (see below). If the color's unnatural, it's YouGottaHaveBlueHair. A possible property of MagicHair.
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*Indexes: HairTropes, ImprobableAppearanceTropes
Hair does take a while to grow out. Using miracle products might do the trick. But in fiction, it does happen.
This trope can happen in 2 ways: Either there's a product that instantly grows hair, or any other way.
Subtrope of ArtisticLicenseBiology. Inversion of HairTodayGoneTomorrow. Expect StatusQuoIsGod if this doesn't stick. RapunzelHair is a SisterTrope and a possible result. See HairReboot when the hair returns to its original form instantly. PowerMakesYourHairGrow is a type 2 subtrope. If the color's unnatural, it's YouGottaHaveBlueHair. A possible property of MagicHair.
!Miracle Hair Product
[[AC: {{Advertising}}]]
* These products are advertised like this. However, they don't actually work like this. It takes a little longer, if it does work.
[[AC:{{Anime}} and {{Manga}}]]
* In ''Manga/RanmaOneHalf'', the title character once accidentally drank a special rice porridge made from a one-of-a-kind dragon's whisker. The porridge made him grow continuously excessive amounts of hair unless his hair was tied up from the dragon's whisker or when he his [[GenderBender gender was changed]].
[[AC: ComicBooks]]
* In the TinTin comic book "Land of Black Gold", Thomson and Thompson find tablets and swallow them, thinking them to be aspirin, causing them to belch continuously, and grow long hair and beards that change colour. The beards grow so fast that they have to be cut multiple times each day.
* In ''AsterixAndCleopatra'', the henchman of the villain Artifis vows never to shave his head again until the pesky Gauls are killed. The rate at which his shaven skull becomes extremely hirsute then becomes a running gag. In another Asterix comic, Getafix creates a potion to restore lost hair, selling it to the Romans who have captured him as the Magic Potion for strength. An entire roman camp - and a small dog licking up the dregs - becomes excessively unmilitary, thus preventing a slovenly appearance to Caesar when he pulls a surprise inspection.
* One ''ComicStrip/LittleLulu'' story focused on Mr. Moppet lamenting over the fact that he doesn't have a full head of hair anymore like he did back in his youth. This prompts Tubby to use his chemistry set to invent a hair growth formula for Mr. Moppet to use. [[GoneHorriblyRight Unfortunately, the formula works too well,]] so Mr. Moppet ends up having to constantly get his hair cut, so Tubby invents an antidote that reverses the effect and Mr. Moppet is bald once again.
[[AC: {{Literature}}]]
* In KevinJAnderson's ''Dan Shamble'' novel ''Hair Raising'', a mad scientist attempts to develop a cosmetic formula that would cause instantaneous hair growth. He eventually succeeds, [[spoiler: but only by using the stolen scalps of werewolves to create it. [[GoneHorriblyRight Then it works ''too'' well,]] and fills his house with hair when some of his invention drips into a clogged-up shower drain.]]
* CharlieAndTheChocolateFactory features Hair Toffee. It makes hair grow on your head , which is perfect for bald people... except the last Oompa-Loompa to test it wound up with hair that grows over ''a foot'' per day, '''constantly'''.
[[AC:TabletopGames]]
* ''TabletopGame/DungeonsAndDragons'' module [=EX1=] ''Dungeonland''. A fountain's water turns into randomly determined potions. One of them is Hairiness: if drunk, the drinker's hair immediately grows longer and thicker.
** ''TabletopGame/DungeonsAndDragons'', 1st Edition supplement ''Unearthed Arcana''. The Hairy cantrip caused a creature's hair to immediately grow 2-12 inches.
[[AC:WebComics]]
* Art was shaved bald as an Easter prank in Phillip Jackson's ''Webcomic/SequentialArt''. He pours a bottle of hair restorer on his dome in strip #132 and waits. No further hair appears on his head, but he does almost instantly push out a Russian czar beard. Next, in strip #133, Scarlet the squirrel-girl lost all her head fur to bubblegum. She ''drinks'' Art's bottle of hair restorer. The result is she gets her head fur back, plus ''triples'' her body fur.
* ''{{Webcomic/City Of Dream}}''. Acknowledges this trope in many strips as an off-screen cure for all the fire spells misfiring. The one who prepares and sells these is owner of a {{The Little Shop That Wasnt There Yesterday}}.
[[AC: WesternAnimation]]
* An old episode of ''WesternAnimation/TheSimpsons'' has Homer uses a miracle hair growth product and gets a full head of hair overnight. But at the end, [[StatusQuoIsGod he loses it]] [[HairTodayGoneTomorrow just as fast]], leaving a hairy trail form his bed to the bathroom.
* ''WesternAnimation/{{The Marvelous Misadventures of Flapjack}}''. Brings an episode with a {{snake oil salesman}} (it is eel in universe) that sells one of these.
!Other Unnatural Causes
* Please put examples of PowerMakesYourHairGrow and HairReboot on their respective pages.
[[AC:{{Advertising}}]]
* During a Capital One commercial, Alec Baldwin and the Vikings have a beard growing contest. The Viking's beard appears instantly. Link: http://www.youtube.com/watch?v=cemiLAxrUvk
[[AC:{{Anime}} and {{Manga}}]]
* Fried and Juvia from ''Manga/FairyTail'' both cut their hair before and after the fighting festival Arc. After the Edolas Arc, it returns to its original length for reasons unknown.
* Iwai from ''Manga/DansaiBunriNoCrimeEdge'', has a curse places on her lineage causing all the females' hair to grow down to their ankles at midnight.
[[AC:ComicBooks]]
* In ''Comicbook/DP7'' David Landers' hair grows very fast as part of his White Event-inspired mutation. Every once in a while he gains about 50 pounds of muscle practically overnight, and that's when his hair grows out.
* HeavenlyNostrils: The [[http://www.gocomics.com/heavenly-nostrils/2012/07/16 July 16, 2012]] strip shows how beholding the glory of Marigold can undo baldheadedness for Dakota.
[[AC:{{Film}}]]
* ''Film/IndianaJonesAndTheLastCrusade''. The BigBad drinks from a false Holy Grail and suffers from RapidAging, including having the hair on his head grow very quickly. Watch it [[http://www.youtube.com/watch?v=-DGFuHC75aY here]].
* ''Film/YellowSubmarine''. While the Beatles are in the Sea of Time they undergo RapidAging and their head hair (including beards and mustaches) start growing out quickly. Watch it [[http://www.youtube.com/watch?v=FDWw1uJFtII#t=28m25s here]].
* In ''TheSantaClause'', once the main character is destined to become the new Santa, his beard grows at an unbelievable rate.
[[AC:Literature]]
* In ''Literature/HarryPotter'' at one point during his childhood, Harry's aunt cut off his bangs so his scar showed. It magically grew back shortly after. Justified because ,well, AWizardDidIt (albeit unknowingly).
[[AC: LiveActionTV]]
* PlayedForLaughs in ''Series/RaumschiffGamestar'': when the (bald) First Mate Stangl starts mutating into the [[TheDreaded Stanglnator]], he suddenly "grows" not only [[BlondGuysAreEvil wild blond hair]], but also a pair of CoolShades, a [[HellBentForLeather leather jacket]], and a [[InstrumentOfMurder battle guitar]].
* Subverted in an episode of ''Series/{{Cheers}}''. The guys have a beard growing contest over the course of a month or so; Cliff's beard doesn't grow in much during the contest, then on measuring day he comes in with a full, lush beard and wins. Then he calls Diane over for some help: he cheated by supergluing hair to his face and now he needs her to take him to the hospital to get it removed.
[[AC:Video Games]]
* This is the case of Millia Rage's hair in GuiltyGear, being alive and prehensile as well. Some of her attacks make her hair grow by necessity.
[[AC:WebComics]]
* In the [[http://egscomics.com/comics/2012/06/20120620_5DEl.png 6-20-13]] ''WebComic/ElGoonishShive'' strip Nanase's head hair starts growing as a result of using one of Tedd's magical watches. [[http://egscomics.com/comics/2012/06/20120622_MovX.png And growing]]. [[http://egscomics.com/comics/2012/06/20120625_wRAD.png And growing]].
* Kili of ''Webcomic/TheDragonDoctors'' contracts lycanthropy and her hair has to be cut every morning, as it's down around her ankles by the end of the day. Sometimes it even grows in response to stress.
[[AC: WesternAnimation]]
* ''WesternAnimation/TheSimpsons''
** When Homer went bald, Marge got [[StatusQuoIsGod God to make Homer's normal hair reappear.]]
** Invokes this when Homer is shaving, possibly to mock the {{Hair Reboot}} as well, Homer will have a clean chin for a few seconds before it grows again. Link for the clip [[http://www.youtube.com/watch?v=wzKbIzdVe-g here]] and if anyone wants the English dialog but less quality [[http://www.youtube.com/watch?v=0gIhaXYAOAQ here]].
* One of Cartoon Network's bumpers shows ''WesternAnimation/JosieAndThePussyCats'' time warping through successive music eras. One of their first style hops was to the Seventies disco era. This caused Valerie's sensible hairstyle to bloom into a large Afro almost instantly. Even Valerie was surprised at this development.
* In ''WesternAnimation/TheSpongeBobSquarePantsMovie'', Mindy tries to convince [=SpongeBob=] and Patrickthat they are men by giving them fake mustaches. Later, they run into tough guy Dennis, who laughs at their pathetic mustaches and show them what a real mustache looks like, by instantly growing one.
** In the actual show, Patrick also has this ability, but with more hairstyles.
* Richard from ''WesternAnimation/TheAmazingWorldOfGumball'', is able to grow a mustache to look tough. The minute he drops the act, it recedes right back into his face.
* Once on ''WesternAnimation/{{Futurama}}'', Zoidberg was so traumatized he grew hair [[LockedIntoStrangeness just so it could turn white]].
* Mr. Barkin's beard in ''WesternAnimation/KimPossible'' apparently grows so fast that he has to shave it 15 times a day.
* {{Averted|Trope}} and played straight in ''WesternAnimation/AdventureTime''. In "To Cut A Woman's Hair", after Finn learns that he doesn't specifically need princess hair to save Jake from a witch, he cuts off his RapunzelHair (which, incidentally, was revealed for the first time in the series). From then on, whenever his hair is depicted, it shown being slightly longer than the last time it was last seen. Then in "Davey" (which was three seasons later), he cuts it again to adopt a disguise. By "A Glitch is a Glitch" (which was only a few episodes later), his hair's back to the sheer length it was when it was first revealed.
Hair does take a while to grow out. Using miracle products might do the trick. But in fiction, it does happen.
This trope can happen in 2 ways: Either there's a product that instantly grows hair, or any other way.
Subtrope of ArtisticLicenseBiology. Inversion of HairTodayGoneTomorrow. Expect StatusQuoIsGod if this doesn't stick. RapunzelHair is a SisterTrope and a possible result. See HairReboot when the hair returns to its original form instantly. PowerMakesYourHairGrow is a type 2 subtrope. If the color's unnatural, it's YouGottaHaveBlueHair. A possible property of MagicHair.
!Miracle Hair Product
[[AC: {{Advertising}}]]
* These products are advertised like this. However, they don't actually work like this. It takes a little longer, if it does work.
[[AC:{{Anime}} and {{Manga}}]]
* In ''Manga/RanmaOneHalf'', the title character once accidentally drank a special rice porridge made from a one-of-a-kind dragon's whisker. The porridge made him grow continuously excessive amounts of hair unless his hair was tied up from the dragon's whisker or when he his [[GenderBender gender was changed]].
[[AC: ComicBooks]]
* In the TinTin comic book "Land of Black Gold", Thomson and Thompson find tablets and swallow them, thinking them to be aspirin, causing them to belch continuously, and grow long hair and beards that change colour. The beards grow so fast that they have to be cut multiple times each day.
* In ''AsterixAndCleopatra'', the henchman of the villain Artifis vows never to shave his head again until the pesky Gauls are killed. The rate at which his shaven skull becomes extremely hirsute then becomes a running gag. In another Asterix comic, Getafix creates a potion to restore lost hair, selling it to the Romans who have captured him as the Magic Potion for strength. An entire roman camp - and a small dog licking up the dregs - becomes excessively unmilitary, thus preventing a slovenly appearance to Caesar when he pulls a surprise inspection.
* One ''ComicStrip/LittleLulu'' story focused on Mr. Moppet lamenting over the fact that he doesn't have a full head of hair anymore like he did back in his youth. This prompts Tubby to use his chemistry set to invent a hair growth formula for Mr. Moppet to use. [[GoneHorriblyRight Unfortunately, the formula works too well,]] so Mr. Moppet ends up having to constantly get his hair cut, so Tubby invents an antidote that reverses the effect and Mr. Moppet is bald once again.
[[AC: {{Literature}}]]
* In KevinJAnderson's ''Dan Shamble'' novel ''Hair Raising'', a mad scientist attempts to develop a cosmetic formula that would cause instantaneous hair growth. He eventually succeeds, [[spoiler: but only by using the stolen scalps of werewolves to create it. [[GoneHorriblyRight Then it works ''too'' well,]] and fills his house with hair when some of his invention drips into a clogged-up shower drain.]]
* CharlieAndTheChocolateFactory features Hair Toffee. It makes hair grow on your head , which is perfect for bald people... except the last Oompa-Loompa to test it wound up with hair that grows over ''a foot'' per day, '''constantly'''.
[[AC:TabletopGames]]
* ''TabletopGame/DungeonsAndDragons'' module [=EX1=] ''Dungeonland''. A fountain's water turns into randomly determined potions. One of them is Hairiness: if drunk, the drinker's hair immediately grows longer and thicker.
** ''TabletopGame/DungeonsAndDragons'', 1st Edition supplement ''Unearthed Arcana''. The Hairy cantrip caused a creature's hair to immediately grow 2-12 inches.
[[AC:WebComics]]
* Art was shaved bald as an Easter prank in Phillip Jackson's ''Webcomic/SequentialArt''. He pours a bottle of hair restorer on his dome in strip #132 and waits. No further hair appears on his head, but he does almost instantly push out a Russian czar beard. Next, in strip #133, Scarlet the squirrel-girl lost all her head fur to bubblegum. She ''drinks'' Art's bottle of hair restorer. The result is she gets her head fur back, plus ''triples'' her body fur.
* ''{{Webcomic/City Of Dream}}''. Acknowledges this trope in many strips as an off-screen cure for all the fire spells misfiring. The one who prepares and sells these is owner of a {{The Little Shop That Wasnt There Yesterday}}.
[[AC: WesternAnimation]]
* An old episode of ''WesternAnimation/TheSimpsons'' has Homer uses a miracle hair growth product and gets a full head of hair overnight. But at the end, [[StatusQuoIsGod he loses it]] [[HairTodayGoneTomorrow just as fast]], leaving a hairy trail form his bed to the bathroom.
* ''WesternAnimation/{{The Marvelous Misadventures of Flapjack}}''. Brings an episode with a {{snake oil salesman}} (it is eel in universe) that sells one of these.
!Other Unnatural Causes
* Please put examples of PowerMakesYourHairGrow and HairReboot on their respective pages.
[[AC:{{Advertising}}]]
* During a Capital One commercial, Alec Baldwin and the Vikings have a beard growing contest. The Viking's beard appears instantly. Link: http://www.youtube.com/watch?v=cemiLAxrUvk
[[AC:{{Anime}} and {{Manga}}]]
* Fried and Juvia from ''Manga/FairyTail'' both cut their hair before and after the fighting festival Arc. After the Edolas Arc, it returns to its original length for reasons unknown.
* Iwai from ''Manga/DansaiBunriNoCrimeEdge'', has a curse places on her lineage causing all the females' hair to grow down to their ankles at midnight.
[[AC:ComicBooks]]
* In ''Comicbook/DP7'' David Landers' hair grows very fast as part of his White Event-inspired mutation. Every once in a while he gains about 50 pounds of muscle practically overnight, and that's when his hair grows out.
* HeavenlyNostrils: The [[http://www.gocomics.com/heavenly-nostrils/2012/07/16 July 16, 2012]] strip shows how beholding the glory of Marigold can undo baldheadedness for Dakota.
[[AC:{{Film}}]]
* ''Film/IndianaJonesAndTheLastCrusade''. The BigBad drinks from a false Holy Grail and suffers from RapidAging, including having the hair on his head grow very quickly. Watch it [[http://www.youtube.com/watch?v=-DGFuHC75aY here]].
* ''Film/YellowSubmarine''. While the Beatles are in the Sea of Time they undergo RapidAging and their head hair (including beards and mustaches) start growing out quickly. Watch it [[http://www.youtube.com/watch?v=FDWw1uJFtII#t=28m25s here]].
* In ''TheSantaClause'', once the main character is destined to become the new Santa, his beard grows at an unbelievable rate.
[[AC:Literature]]
* In ''Literature/HarryPotter'' at one point during his childhood, Harry's aunt cut off his bangs so his scar showed. It magically grew back shortly after. Justified because ,well, AWizardDidIt (albeit unknowingly).
[[AC: LiveActionTV]]
* PlayedForLaughs in ''Series/RaumschiffGamestar'': when the (bald) First Mate Stangl starts mutating into the [[TheDreaded Stanglnator]], he suddenly "grows" not only [[BlondGuysAreEvil wild blond hair]], but also a pair of CoolShades, a [[HellBentForLeather leather jacket]], and a [[InstrumentOfMurder battle guitar]].
* Subverted in an episode of ''Series/{{Cheers}}''. The guys have a beard growing contest over the course of a month or so; Cliff's beard doesn't grow in much during the contest, then on measuring day he comes in with a full, lush beard and wins. Then he calls Diane over for some help: he cheated by supergluing hair to his face and now he needs her to take him to the hospital to get it removed.
[[AC:Video Games]]
* This is the case of Millia Rage's hair in GuiltyGear, being alive and prehensile as well. Some of her attacks make her hair grow by necessity.
[[AC:WebComics]]
* In the [[http://egscomics.com/comics/2012/06/20120620_5DEl.png 6-20-13]] ''WebComic/ElGoonishShive'' strip Nanase's head hair starts growing as a result of using one of Tedd's magical watches. [[http://egscomics.com/comics/2012/06/20120622_MovX.png And growing]]. [[http://egscomics.com/comics/2012/06/20120625_wRAD.png And growing]].
* Kili of ''Webcomic/TheDragonDoctors'' contracts lycanthropy and her hair has to be cut every morning, as it's down around her ankles by the end of the day. Sometimes it even grows in response to stress.
[[AC: WesternAnimation]]
* ''WesternAnimation/TheSimpsons''
** When Homer went bald, Marge got [[StatusQuoIsGod God to make Homer's normal hair reappear.]]
** Invokes this when Homer is shaving, possibly to mock the {{Hair Reboot}} as well, Homer will have a clean chin for a few seconds before it grows again. Link for the clip [[http://www.youtube.com/watch?v=wzKbIzdVe-g here]] and if anyone wants the English dialog but less quality [[http://www.youtube.com/watch?v=0gIhaXYAOAQ here]].
* One of Cartoon Network's bumpers shows ''WesternAnimation/JosieAndThePussyCats'' time warping through successive music eras. One of their first style hops was to the Seventies disco era. This caused Valerie's sensible hairstyle to bloom into a large Afro almost instantly. Even Valerie was surprised at this development.
* In ''WesternAnimation/TheSpongeBobSquarePantsMovie'', Mindy tries to convince [=SpongeBob=] and Patrickthat they are men by giving them fake mustaches. Later, they run into tough guy Dennis, who laughs at their pathetic mustaches and show them what a real mustache looks like, by instantly growing one.
** In the actual show, Patrick also has this ability, but with more hairstyles.
* Richard from ''WesternAnimation/TheAmazingWorldOfGumball'', is able to grow a mustache to look tough. The minute he drops the act, it recedes right back into his face.
* Once on ''WesternAnimation/{{Futurama}}'', Zoidberg was so traumatized he grew hair [[LockedIntoStrangeness just so it could turn white]].
* Mr. Barkin's beard in ''WesternAnimation/KimPossible'' apparently grows so fast that he has to shave it 15 times a day.
* {{Averted|Trope}} and played straight in ''WesternAnimation/AdventureTime''. In "To Cut A Woman's Hair", after Finn learns that he doesn't specifically need princess hair to save Jake from a witch, he cuts off his RapunzelHair (which, incidentally, was revealed for the first time in the series). From then on, whenever his hair is depicted, it shown being slightly longer than the last time it was last seen. Then in "Davey" (which was three seasons later), he cuts it again to adopt a disguise. By "A Glitch is a Glitch" (which was only a few episodes later), his hair's back to the sheer length it was when it was first revealed.
