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"Every single movement just sends boobquakes, or waves of boobquakes all around the place, it's just... Why does it have to be so jelly? I would very much prefer the boob jiggles if they were a bit less over-the-top because... *sigh* Those seem to be made of some kind of... well, corn starch liquid? Ehn. Jello. Jello everywhere."

The technique of drawing a female character with unusually large and buoyant breasts and without a bra, then animating every individual jiggle, sway, bounce and bobble they undergo. Also known as Gainax Bounce or the Gainax Bounce Effect.

The motion so displayed is typically asynchronous — each breast is animated separately and possesses its own individual movement.

The term was coined by fans some time before 1993 and makes reference to the anime production of Studio Gainax, many of whose earlier releases made use of this particular variety of fanservice. According to a Usenet post from 1993, one particular busty young woman from the Gainax anime Otaku no Video inspired a tongue-in-cheek unit of measurement for Gainaxing: one full bounce is apparently equal to one "MistyMay".

When a male character does it, it's a Pec Flex. While pectoral muscles (and by extension, breasts) in Real Life can move independently, the effect is very subtle and it only happens when a person is engaged in highly strenuous activity. This trope is for when a character's pectoral muscles or breasts move a lot more than they ought to, or in ways that are physically impossible (see this page's picture).


For a live action TV series built around this, see Jiggle Show. For real time generation of jiggling movement in video games, see Jiggle Physics.

Do not confuse this with a Gainax Ending - there it's the individual parts of the viewer's brain that gets contorted in different directions.


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    Anime and Manga 
  • GunBuster: The very first occurrence of this trope, originally designed to add more realistic movement to running and walking, but it got out of hand in later years. Even so, it got the show a Fan Nickname of "Bust Gunner".
  • In Akane-iro ni Somaru Saka's eighth episode, whenever the camera focuses on Tsukasa, her breasts appear to take on a life of their own. The first scene, which is just a profile shot of her laughing, has them bouncing up and down like crazy.
  • Yurika in Akikan! actually uses Gainaxing as a strategy. In a baseball game with Yell (who's distracted by moving objects), she apparently plays without a bra on purpose, leading to very springy bouncing that Yell just can't take her eyes off of.
  • The title character in Amazing Nurse Nanako falls prey to this, making an otherwise well plotted series difficult to watch.
  • Exaggerated to the point of ridiculousness in The Ambition of Oda Nobuna, where Katsuie's boobs manage to jiggle in full Breast Plate. Yes, apparently her boobs are so ridiculously bouncy they can bend metal.
  • Miyuki in Basquash!, who has her bouncing breasts take up the entire screen for a good few seconds. Which is taken to the next level with Haruka Gracia, who we get to see jiggle on three separate occasions before actually seeing her face.
  • Played for Fan Disservice in Berserk with Casca, as the only time we see this happen is during her rape by Femto, where the gainaxing actually serves to show how violently she's being assaulted.
  • In chapter 117 of Black Cat, one panel has Saya Minatsuki dodging Creed's slashes, causing her breasts to swing in visibly different directions. She's far from the bounciest female in the series, but she does seem like the kind of girl that would go without a bra in the comfort of her own home (which is where she was when that asshole Creed barged in on her).
  • Played for Laughs in the animated omake of Black Lagoon, when Rock wakes up as a woman... "WITH HUGE BOOBS!". In the series proper, Revy's very acrobatic Gun Fu causes this to occur during her fight scenes. More noticeable in some than others. At least in her case it's justified as it's canon she doesn't wear a bra.
  • Bleach:
    • Rangiku's breasts bounce when she is frightened by Capt. Hitsugaya's intrusion. She even says that they almost popped out of her robe.
    • When Orihime was about to change (in front of Uryu, uncaringly), her breasts just flopped down from her shirt. In the video games, she demonstrates this as well.
    • Cirucci Thunderwitch has a blink-and-you-missed-it one in an omake.
  • Bouquet in the Blue Dragon anime series. Combined with Ms. Fanservice, as her powers only activate when she's naked.
  • Just about any female character in the various Burn Up! animes. ADV's release of Burn Up Excess featured a toggleable alternate subtitle track that actually displayed a tally of how many boob-bounces are shown on screen of each character's chest!
  • Rosette does this in the third episode of Chrono Crusade — unfortunately bad animation makes it look as if she had bags filled with water instead of breasts.
  • Kyou Fujibayashi of CLANNAD Gainaxes like mad in the opening credits of the first season, while bouncing a basketball. Kotomi also does so in the Baseball Episode.
  • This happens to Milly and Shirley during one of the School Festival activity episodes in Code Geass and to Kallen, the most noticeable example being her encounter with Suzaku on Kamine Island. You'd think that Kallen, having one of the larger chests of the female characters featured on the show as well as being the most physical girl, would get a lot more of this during the action sequences but the total count reaches no more than a handful. Well, any more than a handful is a waste.
  • Cowboy Bebop has the character Faye Valentine, who is breathtakingly beautiful with gigantic pneumatic breasts that seem to have minds of their own. Canon indicates that she does this on purpose to distract men. On one occasion, she wears a perfectly normal evening gown.

  • Junko Asagiri from Desert Punk has numerous instances where her huge breasts move out of sync with the rest of her body. In some cases, usually when she's trying to seduce someone, her breasts bounce on their own.
  • Played for Laughs in episode 10 of The Devil Is a Part-Timer! where the bouncing of Chiho's breasts is accompanied by the sound of timpanis.
  • A certain animation team in the rotation for Digimon Savers used this technique on Rosemon, and it's probably not a coincidence that they animated BioLotusmon's only appearance. It's worth noting that before Savers, the only minor use of this trope was in the second Tamers movie — Sakuyamon's bounce a bit when she's freed from a Parasimon tentacle.
  • Digimon Xros Wars has Lilithmon and her boobs (she even fondles with them), and then there's Mervamon for the good guys (the opening even has her boobs bounce!), who even fires lasers from her breasts.
  • Practically every female role in Divergence Eve and its follow-up. It may be noted that outside of this and the fanservicey opener and closer, the series is remarkably serious in tone and tells its story in blissful.
  • Happens to Caulifla in episode 114 of Dragon Ball Super when she does a boxing stance during her fight with Goku.
  • Happens a bit in the Fairy Tail anime with the various girls, most notably Edolas!Wendy.
  • The Familiar of Zero:
    • Siesta pictured here. You're probably not looking at the Love Bubbles surrounding her. Used to great hilarity in one episode when the gang is trapped in a cave. They hear something approaching fast and prepare for a fight, until Saito realizes exactly what that sound is with a priceless look on his face while the viewers get the obligatory chest shot of the approaching Siesta (who's wearing the Sailor Fuku outfit Saito bought earlier).
    • Not to mention Kirche the Ardent. Until Tiffania's debut she was the most buxom character in the series and do often this in the first season.
    • Siesta is nothing compared to Tiffania, who barely has to move to set her breasts bouncing around like Flubber and is often subject of Gag Boobs. In the closing theme for the third season, they shift like a waterbed while she's standing still.
  • Haruhara Haruko in FLCL. It is Gainax after all. Of particular note is the random bunny suit she wears during the big battle in episode 5.
  • Ikumi Mito in the anime of Food Wars!, especially in her usual bikini-top getup. Just sticking her arm out and leaning over slightly is enough to send her breast into a frenzy!
  • This happens in episode 19 of Fullmetal Alchemist: Brotherhood; for unexplainable reasons beyond pointing out that Havoc likes big boobs, Lust's boobs bounce considerably.
  • Angela, an American visitor to Genshiken, displays this conspicuously (complete with bouncing sound effects) to make the differences between Japan and America (or at least Eagleland) more obvious, and to highlight her more upfront attitudes about sex (she is an unashamed Yaoi Fangirl) and maybe a bisexual (she was at least interested in the male oriented hentai as well). Oono also gets this quite often.
  • Ghost in the Shell: Stand Alone Complex. The first view we have of the Hospital Hottie who has come to give Major Kusanagi a new cyborg body is her bouncing breasts. The fanservice is increased tenfold when she starts flirting while examining the Major. Then she turns out to be an enemy planning to kill her.
  • Almost every female character in the anime Girls Bravo. First seen with Miharu while she and Yukinari are running away from the mob of women on her home world, Seiren, during the first episode. The opening scene of the 13th episode shows Kosame shadowboxing while in the shower; during which her breasts bounce with each of her strikes.
  • Godannar takes Gainaxing to the extreme, since even the mecha have breasts (and in one particular case, both the mecha and the pilot have humongous jiggling breasts). The only exception to this is Lou, the show's Token Mini-Moe.
  • Golden Boy did this quite a bit, especially in the first episode (from the owner of a computer software company).
  • Plentiful in Gravion (which provides this page's picture), especially with Mizuki Tachibana, who bounces considerably with the slightest movement, even swallowing. Gainaxing is a signature of Gravion's creator, Masami Obari, present in his works, including the Fatal Fury anime adaptions and Voltage Fighter Gowcaizer, in which it's put to the utmost extreme.
  • Rushuna Tendo, every episode of Grenadier. However, as she keeps her ammo in her cleavage, this is actually somewhat practical. The Big Bad Setsuna, being similarly well-endowed and trained, does the same thing. For extra Gainaxing, she uses her bounce to execute an Unorthodox Reload, which always gets plenty of Male Gaze.
  • While not exactly as flagrant, Murrue Ramius of Gundam SEED has the dubious honor of having her bouncing chest be one of the few whose bouncing was actually animated and used as Stock Footage every time the Archangel took a particularly nasty hit in battle. On top of her introductory shot being to turn around in surprise when the Archangel is bombed upon docking, wherein her breasts bounce and take up the majority of the frame. This seemed to be limited to her, until first officer Natarle Badguirel ended up in command of her own ship, whereupon she gained the suddenly bouncing breasts (albeit not as dramatically given her modest proportions), as did Flay Alster as part of her crew. Whether this is actually an accurate depiction of how breasts move in zero gravity is debatable.
    • Murrue was also the first woman in the Gundam franchise to have her jiggle in the opening credits of the actual series itself. She was replaced in the HD Remaster by Fllay Alster. The James Bond opening credits level nudity is also bra-less and even had male viewers often going "...those don't work that way." Female tropers, on the other hand, winced in pain and often skipped those credits.
    • "They wounded the burst-proof battleship in order to sway the heart of the captain." - Moetan II, volume 1 (the book). Obviously, the word "heart" in the Japanese translation can also mean "breasts".
    • Fllay also displayed quite a big of bounce in the flashbacks to the sex scene with Kira.
    • Parodied in Gundam Build Fighters episode 17. A Dirty Old Man really likes Ramius' bounce.
  • Parodied and lampshaded in an anime-original RPG Episode of Hayate the Combat Butler where the bouncing boobs of the RPG game's boss is focused on constantly and has a sound so audible a character points out that she hears the sound of the bouncing from a considerable distance away.
  • When Ukraine from Hetalia: Axis Powers was featured in episode 42 of the webcast, her Gag Boobs received, well, quite the attention. Her shirt's front button popped out (followed by a later scene where she tries to sew the button back in place). And her boobs make an audible bouncing noise when she moves (which Latvia refers to as "booby bounce" in the English dub).
  • Generally all the girls in High School D×D (especially Rias and Akeno), except the flat-chested Koneko and Asia, with boob bounce sounds.
  • Highschool of the Dead combines Gainaxing with Bullet Time ... and it is ridiculously awesome! According to uncredited analysis, the speed of the breasts in that shot exceeds 1800m/s!
  • Higurashi: When They Cry had this happening to Mion (really Shion). Like every other fanservice trope used, it came off as seriously creepy.
  • Parodied in Haré+Guu in which Gupta thinks back to an anime he saw. see for yourself (NSFW).
  • Heavy Object: Major Capistrano's Gag Boobs seem to have minds of their own.
  • Aria exploits this in I am Behemoth of the S-Rank, But I am Mistaken as a Cat and I Live as a Pet of Elf Girl. She uses the momentum of her massive bosom as major part of her fighting style.
  • Mii in Jungle de Ikou! Gainaxes quite a bit, thanks in part to her huge rack (Mii's breasts are supposed to represent Earth's life-giving energy); this is taken to a somewhat absurd level when Mii uses her powers to turn into a giant.
  • Kill la Kill has this with Ryuko and Satsuki, especially during their transformation sequences..
  • In Kirby: Right Back at Ya! the appropriately-named Bouncy Tiff, who is created to the real Tiff's dismay. She is drawn like a stereotypical magical girl and... err, deserves the "bouncy" portion of her name. Even the youngest character in the crew knows to cover his eyes.
  • Happens at one time or another to most of the female cast of the anime releases of the Koihime†Musou franchise who have large breasts, especially to Kannu. Ryuubi even gets to do it on purpose later in the series to lure someone into a trap.
  • Yuriko deliberately does this to Daichi while on the train in episode 6 of Kotoura-san. He ignores it, much to her frustration.
  • Ladies Versus Butlers! is full of this, having ample fanservice moments. Sernia Iori Flameheart in particular, she even gets the sound effects, generally the other girls don't.
  • Patricia Martin displays it during while cheerleading in Lucky Star's opening Dancing Theme.
  • You'll see Lara's breasts in Lupin III: The Secret of Twilight Gemini bouncing independently during both of her chase scenes, since the camera stays focused on her boobs. Also seen near the end, when Bultokari saves her with his pick-up truck.
  • Chapter 95 of the manga Mx0 plays this trope for satire with a magical liquid that makes some (already extremely buxom) girls' breasts experience only 1/6 normal gravity. The result is a lot of bouncing, first from falling, then from wind, then an earthquake.
  • Macross Frontier features a whole raft of characters with sufficiently Gainaxed breasts, including Sheryl and the Miss Macross Frontier contestants (which makes Ranka uncomfortable.) Also, zero gravity bouncing. Very unique. When a fully sized, thirty-foot-tall Zentraedi, Klan Klein has a rather terrifying bust that may actually be capable of killing a normal-sized human. Micronized, however, she doesn't possess anything that can be Gainaxed.
  • Mune-mune Magical Shopping Arcade Abenobashi has large breasts that bounce frequently and usually with no movement from the rest of her body.
  • Caldina does this deliberately in Magic Knight Rayearth whenever she brags about her body.
  • Majikoi! Love Me Seriously! has Momoyo, whose Boobs of Steel defy gravity.
  • In the Makai Senki Disgaea anime, we have Jennifer, the female assistant of Captain Gordon, Defender of Earth!. The sight of her chest bouncing is enough to make Laharl sick.
  • The Melancholy of Haruhi Suzumiya: Mikuru Asahina, the Moe character, displays Gainaxing, particularly in the opening credits.
    Kyon: Too many beach balls!
    Also very evident in the ending credits, especially at 13 seconds - 16 seconds (she's on the right). It's even lampshaded in a Season 2 dub outtake - "Look at these things, they move independently of each other!"
  • Kurokami Medaka has this all the time in the Animated Adaptation of Medaka Box. Complete with the bouncy sound effect. Well, it is a Studio Gainax anime...
  • Quetzalcoatl/Lucoa from Miss Kobayashi's Dragon Maid has the largest boobs in the group and is the most prone to gainaxing. Tohru and Elma's introduction scenes also have their undeniably large breasts bouncing, what with Tohru's doing it upon landing in front of Kobayashi, and Elma's as she was standing up after her dynamic entry into Kobayashi's home. It seems that all dragons end up growing huge tracts of land when they come of age (Kanna doesn't count, since she's a child by dragon standards).
  • Miss Machiko was perhaps the first anime to do this, although the gainaxing in that show is tame by today's standards.
  • Centorea in Monster Musume. Her breasts bounce a lot thanks to their size and her lack of a bra. This actually turns out to be a problem in Chapter 29, as the bouncing keeps throwing off her aim while jousting.
  • Chu's entire entourage in Mouse, even the flat chested one.
  • Mai from My-HiME dresses conservatively, but her somewhat large (but not Gag Boobs-level) chest still has a bit of bounce to it. A scene early in the anime replicated during an argument with Yuuichi and Shiho gives them an audible "boing". According to supplemental materials, it's not even Mai who has the largest bustline. She's beaten out ever-so-slightly by Haruka, who doesn't have a whole lot of bounce, but still looks good in a swimsuit.
    • Strangely enough, while attention is frequently called to her lack of a chest in the original series, Arika in Mai-Otome Zwei starts bouncing quite noticeably, especially whenever she prepares to use her signature move. One could argue, though, that she has filled out in the one year since the end of the series.
  • Mai Kawakami in the animated adaptation of Myriad Colors Phantom World is probably the bustiest girl on the show, and jiggles quite a bit. In the first episode Mai is the last contestant in a limbo contest. Unfortunately, she's also in danger of losing because her large breasts won't fit under the rope. To get under the rope she starts bouncing her breasts so that when they reach their lowest point she slips under the rope. Note that this would really only work in real life if 1) she wasn't wearing a bra and 2) her breasts were made of jello.
  • Done in Negima! Magister Negi Magi through use of a sound effect. The sound of a bouncing breast is, strangely, bwabitib.
  • While Asuka in Neon Genesis Evangelion generally doesn't jiggle due to a thirteen year old not really having anything that can jiggle, she gets an inexplicable cup size upgrade and visibly jiggles when Shinji unintentionally rips her gown open in End of Evangelion's infamous hospital scene (done by Gainax, of course). A straighter example occurs in Rebuild of Evangelion's second movie, when Mari is enjoying her new plugsuit and playfully jiggles her breasts while the camera focuses directly on them. The third movie ups that further with Mari's breasts animatedly bouncing around while her Eva is sprinting during an otherwise dead-serious scene, complete with the camera looking at her from below so that her chest, face and whatever she's looking at are all in the frame.
  • One Piece:
    • The seventh movie had the girls bounce from doing absolutely anything. Hell, in a few scenes, Nami will simply be standing around, perfectly still, and her boobs will just randomly bounce quite forcefully all on their own.
    • Used again slightly more subtly during the Spa Island Filler Arc. Also Chick Ivankoff. In the latter case, whether it's Fanservice or not is up to you.
    • Used later in the Marineford Arc with scenes of Hancock's boobs bouncing every time she moved around.
    • Also used in the tenth One Piece movie when Nami runs down some stairs.
  • Done poorly with Bekira in Our Home's Fox Deity. Kind of lampshaded by Noboru taking a quick glance at Kou's assets for comparison. Subverted later on when it turns out those weren't actually her breasts.
  • The sheer quantity of gainaxing found in the anime Plastic Little inspired ADV, the North American distributor/dub house, to include an on-screen "Jiggle Count" meter as one of the special features in their DVD release.
  • Check the Beach Episode of Please Teacher!.
  • Queen's Blade episode nine introduces Cattleya, the franchises bustiest character with a 120cm bust size. Despite the size her of her breasts, which would be very heavy, in that specific episode they are given extremely floaty animation. In one battle, blocking an attack manages to bounce them so high they cover her face.
  • Rail Wars!. From both the main girl, but Haruka is the most focused on. For example, during the track scene in school, the camera goes to Shou, confirming his athletic ability, whereas the camera goes to Haruka panting and her breasts bouncing everywhere.
  • Every female character that appears in the various Ranma ½ motion pictures — even the ones who are supposed to be small-breasted. This contrasts with the main series where they never seem to move at all, since the show is kind of old and didn't have a huge budget. May be at least partly Creator Appeal, on the part of animation director Atsuko Nakajima, who was so infamous for drawing her characters this way in the mid-90s that it earned her the nickname "Knockerjima".
  • Studio Gainax is responsible for animating the Re: Cutie Honey OVAs. Hoo boy, is there ever Gainaxing in that show.
  • The eponymous Rio from Rio -Rainbow Gate!- has very bouncy assets, which get ample emphasis in the show. The fact that she dresses in an extremely revealing manner for a casino croupier, baring her midriff and wearing an ultra-short skirt, only exacerbates this.
  • R.O.D. TV had one particularly infamous chase sequence where Nenene finally finds her long lost friend (love?) Yomiko Readman. Yomiko runs away and Nenene gives chase. As they sprint, their bosoms (which had been largely still until then) bounce and sway like jello earthquakes. It's also worth noting that Yomiko's bustline went from a mild C-Cup in the OVA well into DD territory for the TV series, set several years later. A late blooming?
    • It isn't just the chase scene. Watch Nenene's bosom in the first episode. They ripple like water.
  • Kurono Kurumu in Rosario + Vampire. The movement of her breasts even produces audible sounds! And in episode 4, Kurumu's fat stalker (or rather, his belly).
  • Surprisingly, several girls in the Saiyuki anime jiggle around in action, even though the show is mostly fangirl fodder. Then again, the franchise was originally marketed as Shonen.
  • Nodoka of Saki says hi. Just the simple act of walking could get her breasts jiggling. A critic from the Anime News Network site once noticed that her entire wardrobe is sewn in just the right way for her shirts to perfectly cup her chest.
  • Sakura Trick does that on Haruka's self-declared D-cups. Kotone sometimes has this treatment.
  • Parodied in Samurai Champloo when small-chested Fuu decides to carry a couple of cherry bombs by sticking them down the front of her kimono. And then she goes for a run. The result is quite comical, which is compounded by the occasional viewer who didn't notice the cherry bomb thing and thinks that her breasts have just gone insane.
  • Played for Laughs in Seitokai Yakuindomo with Aria Ichijou. Being Ms. Fanservice, her boobs jiggle on occasion, often to emphasize how jealous the other girls are of her size. At one point, she willed them to bounce on their own when the discussion turned to them.
  • Kasuga from Sengoku Basara series (anime) not only gets bigger boobs than in the game, but they visibly bounce around when she moves quickly. Seeing her status as Ms. Fanservice, it's not surprising.
  • Margery Daw in Shakugan no Shana's Festival Episode.
  • The SHUFFLE! OVA had Sia and Asa Gainax within the first three minutes. Then when Sia's dad replaces the water in the pool with eels, Nerine does as well.
  • Happens a few times in Slayers, with the leading contender being the balloon-breasted Naga the Serpent; it almost got her killed once, her rack sprang back into shape after being pressed against a wall, nearly launching her over a cliff. Surprisingly, Amelia, one of the protagonists, is quite busty (to the point that Lina hates her for it), but she isn't subjected to this trope, save for the Slayers Premium movie, where it's actually used as a part of her flanderized chew toy status. Newer anime seasons also made up for this by having Amelia be subjected to breast-squeezing Combat Tentacles in one battle, and then having her tunic partially ripped from her breasts after another battle.
  • Yoko, and Kittan's three sisters (who come in small, medium and large for your viewing pleasure) in Tengen Toppa Gurren Lagann. Guess who it's made by. In fact, the English trailer for Gurren Lagann contained the words "that famous Gainax bounce". Yoko is an especially amusing example because her breasts seem to spontaneously Gainax without any movement on her part, whenever any attention is called to them.
  • Done hilariously in the Beach Episode of Tokimeki Memorial Only Love with swimming team captain Koayu Utsumi, whose Gag Boobs jiggle just from her merely looking around, complete with sound effects (and it doesn't help that it's getting all the attention of all the guys around, which she hates so much, and especially since she's on lifeguard duty at the time).
  • To Love-Ru seems overly fond of this. Espically Lala. Just watch the OVA opening, 1 minute and 30 seconds of pure bounce.
  • Even one of the more serene shows, Umi Monogatari, gets a chance to indulge in this trope. Oshima, Kanon's rival, is flaunting her own bust size, when Marin comes running up to greet her. Marin, already halfway to being an Innocent Fanservice Girl, is not wearing a bra. The results leave Oshima stunned.
  • The anime of Umineko: When They Cry gave most of the women and girls a bad tendency to do this, which would be fine if this were a comedy series. Unfortunately, Umineko is not a comedy series. Poor Shannon has the worst of it. Every time she makes a sudden movement or reacts to something, her boobs also react, with a single bounce.
  • Valkyrie Drive: Mermaid has a lot of it. Let's just say if you have anything approaching a decent cup size, you're going to be bouncing all over the place.

    Eastern Animation 
  • Aachi and Ssipak has a female character that does this throughout the movie to hilarious effect. At one point, she somehow manages to find herself strapped to a motorcycle, riding on her rack, while bouncing down some stairs.

  • Luna's new body in A Discordant Note has what she and Harry call anime boobs. While trying out her new body, Luna's bouncing is described as "deserving a soundtrack".

    Films — Animation 
  • Ralph Bakshi's Fire and Ice features a very early (1983) pair of life-drawn (but hugely amplified) bouncing breasts on Princess Teegra.

    Film — Live Action 
  • When Evil Calls: Michael ogles the female basketball players while they practice, with their breasts bouncing. Then after he makes his wish he sees them bouncing nude as well.
  • Jessica Rabbit from Who Framed Roger Rabbit. Her breasts were purposely drawn to bounce in the opposite rhythm of a normal female's chest while walking; she bounces down when a real person would bounce up, and vice versa. They go "boing"!


    Live-Action TV 
  • Crazy Ex-Girlfriend has an entire song about this called "Heavy Boobs". Namely, how doing this actually hurts like hell, especially if they're sensitive for some reason or another. By the end of the song, all the dancers are wincing.
  • Dark Matter: Five's season 2 wardrobe doesn't appear to include a proper bra, a fact that is most obvious during her running scenes in "I've Seen the Other Side of You".
  • Killing Eve: Villanelle has this happen as she's chasing Konstantin.
  • The Wilds: Nora displays this while running with Quinn in a flashback, apparently not having a bra on at the time.

    Music Videos 
  • The Caramella Girls in the official Caramelldansen music video, though it can be hard to spot due to the screen also bouncing.
  • As mentioned on the Gag Boobs page, the video for "Turn Down For What" features this trope taken to an extreme, where a middle-aged woman's breasts move (independently!) in time with the song's beat.
  • Ootsuka Ai's "Pon Pon" has a fan-made video floating around that ratchets this trope Up to Eleven. Imagine hundreds of bouncing, jiggling, animated breasts from every anime ever, all edited in rapid-fire sequence and in perfect time with an equally bouncy, infectious J-Pop song that you’ll never get out of your head. The whole effect is simply glorious.

  • In Baywatch, the Match Sequence has the camera pan down a line of female Baywatch lifeguards wearing sexy swimsuits. An operator configuration enables jiggling breasts.
  • Downplayed in Aerosmith. "Walk This Way" begins with a shot of three girls at an Aerosmith concert, all with noticeably jiggly breasts - but they're shown from behind, obfuscating their movement.

    Video Games 
  • Akatsuki Blitzkampf gives us Marilyn Sue, who's popular with fans both for her powerful, hard-hitting fighting style and for her huge, huge jugs that bounce and swing every which way as she smacks around her opponents.
  • Atelier Escha & Logy: Threia has the largest breasts in the party, and they bounce for no reason during her level-up animation.
  • BlazBlue:
  • Mai Shiranui from the Fatal Fury and The King of Fighters series. The Fatal Fury anime movie, in particular, was infamous for the animators actually showing (very, very briefly) the inevitable wardrobe malfunctions her bouncing breasts would cause in her distinctive costume during fight scenes. Viz Video, who released Fatal Fury in the U.S., used to show her bouncing in the trailers while the narrator made enthusiastic reference to "dual-independent-suspension ninja girl Mai Shiranui". Although her design in the first few games was relatively more conservative, the anime (and the 2D Jiggle Physics in The King of Fighters videogames) resulted in her Flanderization into a walking incarnation of this trope. In fact, the latest incarnation of the King of Fighters takes this to Serial Escalation levels. Even in the Neo Geo Pocket games where she appears her breasts jiggle!
  • Gwent: The Witcher Card Game: Manually shifting Ves's premium card left and right generates a notable jiggle in her chest.
  • Every single game from Japanese H-Game maker Illusion. Being strictly h-games they generally have controls that affect the size, shape, firmness, effects of gravity... Surprisingly, somehow they seem to have averted (mostly) in their latest game which uses a different, much more realistic (for varying degrees of realistic) engine versus their traditional anime-esque style games. There is still bounce, but much less Gainaxey.
  • JoJo's Bizarre Adventure: Eyes of Heaven usually averts this, but it does give one character boob physics- Joseph, in his 'Tequila Joseph' outfit (based off Joseph's very poor attempt at a Harmless Lady Disguise).
  • Kongiku from Muramasa: The Demon Blade has very large breasts that tend to wobble and jiggle constantly, even when she's not doing much other than standing there, breathing. The jiggle isn't as exaggerated as the most extreme examples of this trope, but is quite noticeable.
  • Dr. Naomi in No More Heroes 2: Desperate Struggle has a preposterous bounce animation triggered when the player speaks to her in the laboratory. The self-awareness of this is heightened by Naomi's comment, "Quit staring at me! I know what you're thinking— and NO!", a nod to the fact that she appears to have grown since the first game in the series and been put in an impossibly small top. It is a simply wonderful piece of Fanservice. It's also found in the intro to Pure White Lover Bizarre Jelly, a parody of Magical Girls and Moe.
  • Odin Sphere: The Vulcans' assets seem to bounce while breathing. Velvet visibly bounces when crouching, getting up and running too. At least Odette has an excuse: Her huge breasts have no muscles to support them because of her skeletal shoulders and back.
  • The priestess Rao in Ōkami jiggles wildly every time you meet her, including after she's possessed by the demon Ninetails. Issun rarely refers to her as anything but "busty babe", even to her face. It's mentioned in the game's official art book that one of the programmers created a "bounce and sway program" with "great attention to detail" to get Rao's breasts to jiggle just right.
  • Most of the female champions in Paladins display this, which is particularly noticeable when they perform their taunts. As Hi-Rez tradition, the breast movements are pre-rendered instead of having real-time jiggle physics.
  • April May in Phoenix Wright: Ace Attorney shook her stuff when flirting or when she got extremely pissed off. Then there's the hentai fan-game Phoenix Drive, in which female characters' breasts spontaneously Gainax every few seconds, much as humans' eyes spontaneously blink.
  • Resonance of Fate gives us Countess Barbarella, is seen only once in the game while eating. While she does so, her breasts bounce enough to make the laws of physics cry in a corner. Vashyron has a hilarious internal monologue about her bunker busters.
  • Rhapsody: A Musical Adventure has the witch Majorly, who along with barely wearing anything at all, bounces with almost every movement.
  • Star Ocean: The Last Hope has Myuria, whose breasts have LOTS of room to move about.
  • Queen Valentina from the original Super Mario RPG had a conspicuously long after-hit animation that consisted solely of her flinching and jiggling for a few seconds.
    • It's notable that the jiggling part lasts about 3 times longer than the flinch.
    • Flurrie from Paper Mario: The Thousand-Year Door has a sound effect that goes with her breasts bouncing.
  • Super Robot Wars, despite being a video game where all the action is done by Giant Robots, has rather extensive bouncing in the anime-ish cut-in pictures. Very prevalent in the Alpha series, where you can expect any original female character to have Gainaxing bounce, unless her name is Ibis Douglas. This also gets carried over to the latter handheld SRW games, such as J and W. (Un)fortunately, Super Robot Wars Original Generation somewhat mellowed or stopped this practice. As for the anime characters, whether or not they do this seems to depend on how fanservicey the character was in their original anime, eg Yoko Littner will bounce all over the place, but they'll be nary a jiggle from the Eva girls.
    • Only for Endless Frontier to bring it back in a grand fashion: 3 of the playable characters happily show off their bosom every time you perform their Limit Break (two of them involving a mechanism specifically designed to remove the cloth covering their cleavage), and most female bosses are happy to do this as well. Even Xiaomu, the second-least well endowed party member, still puts on a helluva show, but the prize goes to Kaguya, whose "tracts of land" take every opportunity to "earthquake."
      • Funnily enough, even Xiaomu, from Namco × Capcom has what little cleavage she has bounce. In fact, every female character with the exception of Suzuka and Kyon Feulion have bouncy breasts.
    • It starts at Alpha 2 and Alpha 3 had the most extreme version of this (looking at you, Selena Recital). After that, the bounce is a bit more in line with realism. By Z, the bounce is fairly tame and looks fairly natural (which is impressive given Xine's impressive rack).
    • In fact, there's a fan-made montage of these cutins in Super Robot Wars Z2: Saisei-Hen, set to DYNAMITE EXPLOSION
  • Tomb Raider's main character, Lara Croft, gets pretty jiggly. Especially in the sixth game in the series, The Angel of Darkness.
  • As of installment #13.5, Hopeless Masquerade, even ''Touhou Project has gotten in on the action. Although only one character actually bounces.
  • Selvaria of Valkyria Chronicles. Most of her major scenes focus either on her flaming blue badassity, or her.. um, "talents", and the jiggling is truly astounding when the camera's on them. One particularly dramatic scene suffers because of the focus on her breasts bouncing around in different directions.
  • Witch Hunt features gainaxing with extra Fanservice at the end of each level, when the player character Lucile jumps towards the screen, giving a panty flash and bouncing her breasts in a double thumbs up. The game also gives the player the option to disable this scene.
  • Played for Fan Disservice in Final Fantasy Tactics: It's the Zodiac Beasts and their Ultima Demons that have the most blatant jiggling pecs (and the final boss, despite having the title "Nice Body", was not given any jiggle at all).

    Web Animation 
  • In the "Growing Pains" animation produced for NEMO Science Museum's "Teen Facts" exhibit, while the narrator describes the final developments of male puberty (such as ejaculation and body hair), the girl becomes interested in how her own body had developed, clearly enjoying swaying her hips and making her breasts bounce. Especially making her breasts bounce.
  • On Shut Up! Cartoons we have a few examples:
    • Oishi from Oishi Highschool Battle is gainaxing all the time. Oishi breasts are actually prehensile, on occasion the reach out and smack people, or fire laser beams from her nipples.
    • A sequence in Samurai Daycare opening is a close-up of asymmetrical breast-jiggle.
  • Appears to have been attempted in Acedemy Sugoi Seiun when Sakura is running to school, but due to the animation being only 2 frames it's hard to tell.
  • Emerald is subject to this in RWBY, even more so than Yang thanks to having a gigantic cleavage window. Her model was specifically designed so her chest moved asynchronously, leading to the animators having to tone it down at times. After Season 3, however, the change in the animation engine used (as well as the death of Monty Oum) have put an end to this, and no breast jiggle has been seen in the series since.

  • In a Wonder Woman parody strip, she and Superman are fending off some bad guys shooting at them. Superman stands in his trademark pose while the bullets bounce off of him, and he asks Diana why she blocks with her bracelets if she's invulnerable like he is. She stops blocking and lets the bullets hit her; they bounce harmlessly off her chest...but her breasts bounce back at every hit. The bad guys catch on and they all start shooting at her breasts to enjoy the show. She simply looks at Supes with an "I rest my case" expression. He concedes her point and she goes back to blocking.
  • In C Karrus, Juline's breasts seem to do this with every movement, partially contributing to her constant wardrobe malfunctions.
  • In GunKitty the character Yumi Bloom's breasts jiggle in almost every other panel.

    Western Animation 
  • Mrs. Beady from Barnyard and Back at the Barnyard has her boobs jiggle, even when she gets up from the chair. A case of this being used for Fan Disservice, considering she's not very good looking.
  • Manuela from the Les Lascars, even when she does the smallest movement like turning her head, her boobs move.
  • In the American Dad! episode "Helping Handis", Steve ends up growing a pair of boobs as a result of an experimental steroid given to him by his dad. Steve's newly developed breasts jiggle quite a lot throughout the episode.
  • The aptly named Big Boob June from The Cleveland Show, whose breasts jiggle with nearly every movement she makes.
  • One Family Guy episode has Lois' boobs swelling up as a result of breastfeeding Stewie while he was teething. Peter, in an attempt to get Quagmire to realize that he's making a mistake by getting married, purposely shakes Lois which jiggles her boobs.
  • Vanessa Warfield's breasts can be seen jiggling as she runs in the M.A.S.K. episode "Riddle of the Raven Master".
  • In the Teen Titans episode "Date with Destiny", Starfire's chest briefly bounces while she vehemently refuses to agree to the demand that Robin takes Kitten to the prom. Naturally, Robin doesn't want to either, but they have little choice, or else Jump City would be overrun with Killer Moth's mutated swarm of moths.


Video Example(s):

Alternative Title(s): Big Bouncy Breasts, Breast Physics, Gainax Bounce, Wibble


Galloping Centaur

Centorea rushes down the street.

How well does it match the trope?

5 (9 votes)

Example of:

Main / Gainaxing

Media sources:

Main / Gainaxing