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Weaksauce Weakness

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Metro Man: Copper... drains... my powers!
Megamind: Your weakness is copper? You're kidding, right?
Megamind (He was.)

Being a Super Hero ain't easy. Most of the original Flying Bricks have the good Achilles heels covered, and the pharmacy is even out of Psycho Serum to give you a cheap Backstory gimmick to explain your powers.

What's left for the modern hero and villain to do? Make do with a Weaksauce Weakness. It's great for comedic effect, but just as often it ends up being an Achilles' Heel that makes your average Mundane Solution seem perfectly reasonable by comparison.

The weakness isn't a common household cleaning agent like Mundane Solution, but something so incredibly, stupidly embarrassing you'd think the Super Hero would never use his power out of shame in the off chance someone found out about it, or because it shows up regularly in the course of their super heroing. The "weakness" might come in the form of the fuel for the super power, a humiliating Transformation Sequence or activation phrase, an Embarrassing but Empowering Outfit, or just a set of restrictions on the powers that really are begging to get laughed at. Therefore, this is one of the most popular ways to Bless your hero With Suck.


If the weakness is a Logical Weakness, it can be pulled off. If not, it can seriously stress the Willing Suspension of Disbelief, unless it's Played for Laughs.

Especially cruel writers will have clever villains make it a Weaponized Weakness. However, a Kryptonite-Proof Suit can even the odds.

This is also commonly exploited in an Easily Thwarted Alien Invasion, where Bizarre Alien Biology is probably to blame.

Subtropes include:

Related to Why Did It Have to Be Snakes? See also Kryptonite Factor, which is a weaksauce weakness for superheroes. If played for laughs, the one so harmed may Fight Off the Kryptonite. In extreme cases, the character will defend themselves from the weakness with a Cross-Melting Aura. For the inversion, of being at risk from a lack of something, see Phlebotinum Dependence.



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  • A Cartoon Network bumper featured the Superfriends. Zan of the Wonder Twins laments his power to turn into water as being weak.
    "I can be defeated by a sponge. It doesn't even have to be an evil sponge!"

    Anime & Manga 
  • Tobor, the 8th Man, recharged his powers with an inhalant stored in small, thin, white tubes that he carried in a cigarette case. When the bad guys allowed him "one last smoke" before executing him, this was great; when he was having a fight where kids could see him, he worried about setting a bad example by appearing to smoke.
  • Ah! My Goddess:
    • Urd is put to sleep by Enka music, traditional Japanese ballads (in the Viz translation, it becomes polka music). When someone tries to take advantage of this fact, she just pops in earplugs.
    • Mara is weak to rock music; it causes her to dance uncontrollably.
  • Shiina from Angel Beats! is Ranma turned Up to Eleven: a ridiculously hypercompetent ninja, but when she sees a puppy about to go over a waterfall she instinctively does a Stupid Sacrifice, getting them both killed...and it was a stuffed puppy. The puppy trap was actually meant for Angel, so it's possible she has the same weakness.
  • In Bleach, the Noveno Espada Aaroniero Arruruerie can't use his shapeshifting when in sunlight. Though he can still use any of his other 30,000+ powers (not that he does before getting killed, but he had the option). To make matters worse, he lives in Hueco Mundo, which has no natural sun. His boss builds a fake one for no discernible reason.
  • In Cowboy Bebop, Pierrot le Fou a.k.a. Tongpu is a psychotic, unstoppable, bulletproof Psychopathic Manchild. He has exactly two weaknesses, both psychological: A pathological fear of cats due to the experiments that he was subjected to, and feeling pain, induced in this case by Spike hurling a knife (a projectile too slow to be stopped by Pierrot's experimental shield) into his thigh.
  • From Cromartie High School:
    My name is Yutaka Takenouchi, and I have only one weakness ... I am very susceptible to motion sickness!
  • Dandadan: The mantis shrimp Gig Worker has the punching ability of a mantis shrimp, and is even more powerful underwater, but doesn't have gills, so it keeps having to surface to breathe.
  • Don't Meddle with My Daughter!: As a goddess, Athena possesses Herculean strength and nigh-invulnerability. So her enemies learned to use her feminine modesty against her, by sexually molesting her in public.
  • Dragon Ball:
    • The only way to defeat Chiaotzu's psychic attacks is to break his concentration. Krillin does this quite comically by asking him extremely basic math questions. Like 9 - 1. After that, his teacher the Crane Hermit immediately gave him remedial math lessons.
    • The sound of whistling can seriously incapacitate Namekians, as a result of their incredibly acute senses of hearing. This becomes a plot point in Dragon Ball Z: Lord Slug where Piccolo asks Gohan to start whistling after ripping off his own ears in a desperate attempt to stop Lord Slug.
    • In the Otherworld Tournament filler, Goku shows that he's exceptionally vulnerable to being tickled given that Caterpy is able to hold Goku in place and torture him for several minutes despite Goku being many times stronger than him without becoming a Super Saiyan.
    • In each of their respective Non-Serial Movie appearances, the embodiments of evil Hirudegarn and Janemba become defenseless when enraged/insulted.
  • Dragon Ball Super:
    • A God of Destruction is an extremely powerful being holding its real power back. However, it turns out their existence is tied to the leading Supreme Kai of their universe. If a Supreme Kai were to be killed, the God of Destruction goes away as well. Most of the shown Supreme Kais are unfit for combat and would be easy to dispatch.
    • Auta Magetta is a more direct example in that he is almost completely invulnerable and, when motivated enough, near unstoppable, even with Goku, Vegeta, and the like at the levels of power they're at. He has never been shown to have sustained physical damage of any kind. The only way he's ever been stopped is through exploitation of his low self-esteem and sensitive nature: If he hears anyone insulting him, no matter how mild, he becomes distracted and, eventually, unable to attack or even move as he's paralyzed in sadness. His friend Botamo eventually devises a Mundane Solution to this via plugging his ears while riding on Magetta's shoulders, which apparently is enough to give Super Saiyan Blue Vegeta major problems.
  • Durarara!!:
    • Celty is an immortal dullahan, but has a couple of absurd weaknesses:
      • She is terrified of aliens. In a special side story, she tries to play a video game with 'Blue Kappas' as the monsters with the logic that since they're not aliens, she'll be fine. Unfortunately, the monsters are indeed aliens and she's found an hour later, hiding in a closet.
      • If someone can get her angry enough, such as in the case of Kasane possessing Shinra, Celty will almost instantly turn into an amorphous, insentient monster.
    • Saika can also be undermined if someone has a strong enough pain tolerance, and thus she will be unable to possess them.
    • Despite guns, knives and trucks being ineffective against Shizuo, as it turns out, pens work. Somehow. He also is just as vulnerable to suffocation as anyone else.
    • Downplayed in Ruri's case since, as a dhampir, she only gets sunburns very easily and does not like garlic.
  • Fairy Tail:
    • Natsu is Made of Iron, he can breathe fire and cause massive property damage simply by punching someone, but he too suffers from the ignominious susceptibility to transportation. At least once it was actually exploited to defeat him in battle. This motion sickness seems to extend to being carried by people, as well. He's perfectly fine being taken to flight by Happy the cat, however, reasoning that Happy isn't a vehicle. According to Rogue, all Dragon Slayers suffer from this.
    • Wendy however, doesn't suffer from transportation. Rather, She's weak to pickled plums. After the 1-year timeskip, she started to suffer from transportation.
    • Gajeel, similarly only began suffering from motion sickness after joining Fairy Tail. It's never explained why it never bothered him before, only that eventually all Dragon Slayers gain this weakness. Even the artificially-created ones like Laxus and Cobra suffer from it.
    • The first Dragon Slayer Irene Belserion eventually explains that this is because becoming a Dragon Slayer involves being infused with Dragon magic, which effectively makes them part Dragon. As a Dragon Slayer's power increases, they become more Dragon-like to the point of becoming Dragons if the process isn't halted somehow. The Bizarre Alien Senses of Dragons don't mix well with human bodies, and even Acnologia, the nigh-invulnerable unstoppable Dragon King is just as vulnerable, nearly throwing up from literally holding onto the side of a speeding airship.
  • In Fukashigi Philia, the villain Shidow is extremely fearful towards water to the point if he gets in contact with it, he will go berserk and have his abilities neutralized.
    • All of the Abilities Users created by Noa and Isumi have a particular weakness - it's usually whatever originally killed them (such as water for Shidow, who drowned, or dry ice for another, who froze to death).
  • Fullmetal Alchemist:
    • In the manga and second anime, Pride can project razor-sharp tentacle-like shadows from his body. But he can only project them where ordinary shadows could be cast; complete darkness renders him unable to attack and bright lights can cut off his tentacles. Granted, he is still near immortal even when he can't attack; in a way he is both the most powerful and the most vulnerable homunculus.
    • A common mistake for people in the series is to assume that Flame Alchemist Roy Mustang is useless when wet (or without his gloves). This is only true to a certain extent - while his gloves can't create a spark when they're wet, there's nothing stopping him from using something else in their place (like a lighter) as long as he has access to the right kind of transmutation circle. He's arguably more dangerous with lots of water around so long as he has an alternative method of creating a spark, as he can split the water into hydrogen and oxygen and then ignite it... the problem is that unless he can trap the target in an enclosed area with the water he's liable to blow up any nearby allies and himself at the same time, hence this technique being very rarely used. The joking doesn't change the fact that he definitely earned his rank.
    • A combination of this and Berserk Button: Insulting Ed's height, while entertaining, has a tendency to impair his judgement as he blindly charges the enemy. This is mostly Played for Laughs, although Pride uses it once to get an edge in combat.
      Pride: Appearances can often be deceiving. Isn't that right, little alchemist?
      Ed: Grk!
      (Pride attacks)
    • Played for Laughs in one of the manga's early omake, where Hawkeye defeats both Ed and Al with a magnet.
  • Shiina in Gourmet Girl Graffiti absolutely can't be splashed by rain; any amount would make her instantly sick for a whole week. This is why she was wearing a whole hazmat gear when she's "risking it" to the cram school in chapter 6/episode 4. Dishwater apparently does the same thing, as seen in episode 7.
  • Italy from Hetalia: Axis Powers can run insanely fast, and defeated the Ottoman Empire, which was pretty powerful at the time, while he was only a child. According to the author, the only thing keeping him from dominating Europe is that he's just too afraid to.
  • Fairies from Humanity Has Declined are killed by EM waves, a.k.a. light, the most ubiquitous thing in the universe. If the setting wasn't After the End they'd be screwed. And theystill have problems with it anyway.
  • JoJo's Bizarre Adventure:
    • Vampires are seen as nearly invincible gods among men...unless the sun is out. Or you punch them with sunlight-infused martial arts. Or you hit them really hard in the brain and screw up their ability to control their own bodily functions (though not many beings out there aren't weak to the Chunky Salsa Rule). Or just have a Pillar Man (essentially super vampires) so much as touch them, which will cause them to be instantly absorbed.
    • Pillar Men also have a weakness to the sun and Hamon, but due to their biology (and possibly Kars'/Cars' stone masks) they can turn themselves into something similar to stone blocking off UV rays. When Kars becomes the Ultimate Lifeform, he loses his weakness to the sun among other benefits.
    • Rock Humans in part 8 are resistant to damage and fatigue, but despite being partly rock they're dependent on oxygen, "breathing" it through their skin. This means that submerging them in water causes them to rapidly "suffocate" and break apart, though Josuke probably didn't help matters when he stole the oxygen from one's body in an attempt to force him to surface.
    • Some powerful Stands also incorporate this trope for narrative balance reasons. One key example is Part Four's Red Hot Chili Pepper. Since it becomes stronger and faster the more electricity it has access to, with no stated or hinted upper limit, it can be said to be one of the most powerful stands in Part 4, excluding only arguably Killer Queen: Bites the Dust. But this comes with two weaksauce weaknesses; first, if you cut off its access to electricity, say, by destroying the motorcycle battery it was hiding in, it rapidly weakens and fades. Second, since salt water is such an excellent conductor, immersing it in the ocean will cause it to rapidly dissolve.
    • For certain stands, the user is their weaksauce weakness. All non-automatic stands share damage with their users, but some stands are pretty much impossible to directly hurt, like Yellow Temperance (amorphous blob), The Sun (too hot for anyone to get near it), The Fool, and Horus (can reform from sand and ice, respectively). Their users, on the other hand, can be hurt like normal (and are often glass cannons), and their defeats will cause their stand to de-manifest.
    • There's also The Hand in part 4, a Stand with the ability to literally erase anything, even space itself, from existence. A truly overpowered stand, in principle...except its user is Okuyasu: a Japanese Delinquent with the IQ of a brick wall who doesn't have the brains to use it creatively nor the heart to actually use it directly against people.
  • From Kenichi: The Mightiest Disciple, we have Akisame Koetsuji, the Jujutsu Philosopher. Master martial artist, a doctor so skilled he can raise the recently dead, and master of a bazillion and six other fields. He's one of Kenichi's six super-powerful masters... and green peppers make him so ill that he can be held at bay simply by hanging one outside his door.
  • Kinnikuman is weakened by milk. Though after he goes insane during his match against Curry Cook and drinks the stuff, it becomes apparent that he just thinks it's disgusting.
  • Emperor Nightmare, the leader of Nightmare Enterprises (Holy Nightmare Co. in the Japanese version) in Kirby: Right Back at Ya!, is weak against AND afraid of one weapon that Kirby can take control of by swallowing his Warp Star: the Star Rod.
    Nightmare: Aaaah! How did Kirby discover the secret?! That pitiful little Star Warrior has found my only weakness! I am helpless against the power of the Star Rod! WAAAAUUUUGGGGHHH!!!!
  • Macross:
    • Super Dimension Fortress Macross has an alien attack force made up of gigantic Scary Dogmatic Aliens who are a Proud Warrior Race do a mass Mook–Face Turn because of... singing. And souvenirs. In fairness, it does make sense in the story (at least as much as The War of the Worlds Martians being vulnerable to Earth's diseases) and is perhaps one of the best logical conclusions to a typical alien's Planet of Hats treatment. The Zentradi have no culture to speak of other than fighting, so when exposed to humans and their culture in the form of songs and interacting with the other gender after sending a team of spies to the SDF-1, typical Zentradi start feeling emotions, questioning their purpose, and becoming similar to humans. Because of this, their entire fleet gets deemed "contaminated" by the unexposed Zentradi and programmed for destruction. In the face of this Enemy Civil War, they wisely choose to ally with the humans. Still, it doesn't quite wash away the faint air of ridiculousness when Minmay's singing becomes an offensive weapon to unbalance the unexposed Zentradi in their attack.
      • Those who consider Minmei The Scrappy half-jokingly argue the Zentraedi were distracted by her singing because it was so bad in the Robotech dub.
      • The initial use of Minmay's voice as a weapon is actually short-lived: while the Zentradi were initially too distracted to react, as soon as the heroes opened fire they started firing back. The real decisive weapon in that engagement was Minmei kissing Kaifun: the Zentradi were so disgusted they stopped fighting effectively, trying absolutely anything to erase the image from their minds, including firing in the middle of nowhere (a Zentradi heavy cruiser was observed doing exactly this as Hikaru locked his nukes on it) and listening to Minmei's songs.
    • Taken to even greater extremes in Macross 7 where the spirit draining Protodevilns's only weakness is actually the energy produced by music. It produces a spiritual energy "too pure for them to absorb" and regenerates the lost energy in those drained by them.
      • In one humorous scene, a Protodeviln gets a "brilliant idea" for shielding himself against the humans' singing. He puts on earplugs. This actually does work, but Basara just plays even louder. Afterward the Protodeviln installed a noise canceller in his mech, which proved much more effective.
      • Incidentally, one OVA shows us that Minmei's registered songs have absolutely no effect on unexposed Meltrandi (the FEMALE Zentradi), who just ignore them (partly because they had the common sense to just jam the frequencies used to broadcast them), but BASARA's songs made them groupies the very moment he managed to get them to hear him. It baffled a UN Spacy higher-up, who had assumed the Meltrandi would just jam the broadcast (both times the Minmei tactic had been seen used had been with broadcasts the enemy didn't jam for one reason or another).
  • In Miss Kobayashi's Dragon Maid Tooru mentioned that her friend Herensuge was beaten to death by an egg without a yolk. This is actually a reference to the legend that Herensuge could be killed by cracking an egg on its head.
  • In Moriking, the ridiculously powerful king candidates are all susceptible to cardiac arrest via consuming overly spicy food like kimchi stew or curry. Moriking and Oki find this out the hard way, but it's Played for Laughs and they're perfectly fine afterward.
  • My Monster Secret: Akane is an ancient demon whose powers include mind control, teleportation, shapeshifting, duplicating herself, and summoning meteors. She also has a massive Sweet Tooth, and anyone can foil her plans by holding up a piece of candy, which she will immediately fixate on.
  • In one episode of Myriad Colors Phantom World, the team are pitted against a Youkai Phantom in the form of a sunflower. They can't beat him until Koito works out that because he's a sunflower, he can only face towards the sun. They therefore defeat him by simply walking round him and attacking from behind, where he can't see or reach them.
  • In The Mysterious Cities of Gold, rainbow light causes the Golden Condor to malfunction and crash down on the ground.
  • In Naruto, Konan of the Akatsuki is, like all members of that group, very powerful. Yet her paper-based techniques can be completely nullified by spraying oil on her to make her stick together (a technique one human ninja and some summoned toads have), although water can release her.
  • Adam Blade from NEEDLESS has a weakness for little girls, and usually ended up getting his butt kicked because of this. Though later in the manga his weakness had developed from mere lolis to naked lolis. On the other hand, his love for lolis can temporally boost his strength and saves him from a Lotus-Eater Machine, so it's subverted.
  • One Piece:
    • Anyone who's eaten a Devil Fruit gets amazing powers, but they all share one weakness: the inability to swim. At all. If they are so much as half-submerged in water of any kind, they become paralyzed (and for many, their powers stop working). Which is kind of a problem, seeing as how many of the encountered Devil Fruit users are pirates or marines in a world that's ninety percent ocean. If a Devil Fruit user touches Seastone - a material that has been described as "solid sea" - they'll feel the same effects as if they were fully submerged in water.
    • Though this is more of a subversion in that this weakness very, very rarely becomes an issue, especially considering how many Devil Fruit users are in the series and how four of them are in the main cast. This is even lampshaded in the Enies Lobby arc; when two members of CP9 are trying to decide whether or not to eat Devil Fruits that had been provided to them, Rob Lucci mentions that being unable to swim isn't much of a problem (then again, all members of CP9 have the ability to Double Jump, so there's that).
    • Depending on the situation, basic hypnosis (such as Jango's ring or Ms. Goldenweek's emotion-altering paint) serves as one of the weaknesses for Monkey D. Luffy, the protagonist. Due to his simple-minded nature, he just won't have the sense to turn away, which makes him helpless and left to the devices of his enemies.
    • Water is actually a much greater weakness to Sir Crocodile, as he is a man who can turn into sand, making him Nigh-Invulnerable to most attacks. But if water strikes him, the sand "sticks together," and he is rendered unable to turn into sand at all, thus leaving him fully open to attack. He has a natural defense in that his sand powers extend to causing alarmingly fast dehydration with direct skin contact. In addition, he has the good sense to not only do his villainous business on a relatively large island, but on a desert island. He also uses Dance Powder to not only to frame the king in an effort to overthrow him, but also to stop it from raining in the town he was using as a base. In addition, on the off-chance that someone was able to negate his Logia defense for a significant period of time (like with Luffy), he's a master tactician who's skilled in other combat arts as well. His hook has a second, poisoned hook under it, and if that hook gets broken, he can eject a knife in its place.
    • Fishmen or Fishmen-hybrids who have eaten Devil Fruits are unable to swim like any other Devil Fruit user, but unlike them, they still can breathe underwater. The problem with that is that they can't move underwater without being surrounded by a special coat of bubble.
    • In-universe, at least, we have Enel. His Shock and Awe abilities are considered among the most godlike Devil Fruit powers in the setting, yet Luffy's relatively low-tier Rubber Man powers completely and utterly negated them, to the point that Eneru had to get really creative with his powers just to find a way to harm Luffy at all, and only his unrelated Combat Clairvoyance protected him from getting beaten to a pulp pretty much instantly.
      • Logia-type Devil Fruits in general tend to react weirdly to various elements, and almost always have at least one weakness that completely shuts down their powers. Moreover, hitting their elemental forms with Haki-infused attacks damages them as if they were in regular form.
    • Blackbeard has one of the most powerful abilities in universe. With his Darkness manipulation, he can wipe out entire towns in seconds, shoot the debris out like a cannon, and negate other Devil Fruit powers through physical contact. But he has a major weakness that isn't shared by any other fruit of the same class as his. Most Logia-users are Nigh-Invulnerable due to being able to dematerialize around attacks, but because Blackbeard's ability makes him a "Gravity Man", his body is always in physical form. Not only that, but the same qualities that let him negate other Devil Fruit powers (by forcibly holding their bodies together) also draws attacks INTO him. In short, attacks are both more likely to hit him and always exceptionally damaging.
  • Pokémon Adventures: Roxanne's Nosepass is very powerful, but as it is basically a living compass, it can only face north. Once an opponent can get behind it, it cannot defend itself.
  • Ranma ½:
    • Ranma Saotome can be incapacitated by the mere sight of a cute little kitten. However, those who attempt this should note to apply said weakness quickly and forcefully — prolonged, intense exposure has a tendency to backfire. Thanks to his Gender Bender curse, cold water can also count as a weakness. Technically. Ranma's female form has less strength and reach than his male form (though the anime is explicit that Ranma's speed is boosted in this form, so it's more of a trade), but s/he can still pull off all of his/her normal attacks. Based on a character with an identical curse, it's also possible that being in female form weakens his Ki Attacks.
    • Shampoo and Ryoga Hibiki have an even worse case of the water weakness than Ranma does; Jusenkyo made them become a little kitten and miniature pig respectively when splashed with cold water. So they go from incredibly powerful fighters to harmless little animals whose only recourse is to run or hide until they can get some hot water. Genma Saotome, Ranma's father, subverts it; his panda form loses little, if any, speed and agility while gaining in strength and toughness due to the increased bulk. Mousse, meanwhile, seesaws between subverting this trope and playing it straight with his duck curse; while it is much smaller, weaker and can't use his physical attacks, it can fly and he's still capable of throwing barrages of knives, darts and bombs in it.
    • And a non-water version applies to Happosai, who is such a Dirty Old Man that his perversion becomes his own Achilles heel. If there is a fight serious enough, or a reward great enough, that he can't be immediately distracted from whatever he was doing by the sight of girls in skimpy clothing, bare cleavage or a bra, it hasn't come up in the series. He can even be lured right into dangers simply by tossing a bra in the right place.
    • Spoiled prince Saffron has incredible fire magic powers, the ability to fly and regenerate so fast that he can tear off his own wings to use as throwing weapons and grow them back in seconds, but because of his lax and pampered upbringing he can't take any sort of physical blow and in a world full of martial artists that's a big problem.
  • The specialists, the Paper Sisters in Read or Dream can telekinetically manipulate paper... unless it's wet. This was not a weakness for Yomiko Readman, who is shown on camera manipulating paper while underwater. This is actually explained in-universe. The Paper Sisters' powers are essentially imperfect clones of Yomiko's, artificially created by Dokusensha; which is why they are weaker and more specialized/limited. Water naturally disrupts the structural integrity of paper, and their inferior powers are not sufficient to maintain it the way Yomiko can.
    • One minor villain in R.O.D the TV is an expert on sound, to the point of knowing a certain frequency that can nullify the protagonists' Paper Master abilities, rendering them powerless against him. Anita's solution is to just throw a book at him; A normal, unpowered hardcover book, which flies right past his defenses and hits him right in the face, knocking him out.
  • In Rosario + Vampire, vampires are considered the high end of the monster scale, but the fact that you can take a vampire down with a glass of water kinda puts a dampener on that idea. Though, you'd have to be of werewolf speed to even consider hitting them with the stuff in the first place. Vampires are ironically said to have the most weaknesses compared to any other monster. Things like silver would also do them in. However, they are still incredibly strong even when weakened by those weaknesses, albeit far weaker.
  • The titular servamps of Servamp are made of this. They cannot swim in running water, cannot separate from their eve or both will eventually die, cannot touch holy water without collapsing, will be weakened to the point of personality changes if their contract item breaks and turn into an animal immediately when exposed to sunlight.
    • Tsurugi is a magician and has the same weaknesses as a normal human would (e.i. blood loss, starvation, etc) though he is more resilient. However, as he never learned how to swim and according to himself '[he] sinks like a rock', Tsurugi is so vulnerable to drowning he can't even fill up his bathtub too much.
  • In Slayers, female spell-casters have a very common and mundane weakness: menstruation. During a woman's menstruation period, her magical power output drops tremendously, so much so that even the protagonist, Lina Inverse, who is one of the strongest sorceresses in the entire Slayers setting, is barely able to cast a novice Light spell during her period. This is apparently a well-known weakness, as Zelgadis and even Gourry both figure out why her powers are weakened at one point, though Gourry is so ignorant that he doesn't understand the significance of "that time of the month" and just assumes it's magic-related.
  • The Dai Gurren in Tengen Toppa Gurren Lagann is a walking battleship... that is not designed to go on water. A battleship that isn't designed to go on water.
  • Ushio and Tora: Youkai in general are implied to have all one or two weakness, aside from the common one to Cold Iron and spiritual powers:
    • The Stone Eater (a giant two-headed centipede monster) can be easily killed with a weapon moist in human spittle, a nod to the legend of Hidesato Tawaratota.
    • Fusuma can only be hurt by fire and black laquered teeth. Since he also lives in the sky, Tora lampshades how difficult it is to actually take advantage of said weaknesses.
    • The Vampire is afraid of fire, but also recoils from both Daoist talismans and Christian holy icons, being unable to use any of his powers in front of a crucifix.
    • The jashin Hitotsuki, according to the manual, can't stand tobacco smoke.
    • The Yamauo normally dwells deep below the surface, but exposure to sunlight makes him explode into smithereens.
  • Yu-Gi-Oh! ARC-V: Gongenzaka's Superheavy Samurai Deck functions without having Spell/Trap Cards in his Graveyards, so he cannot pick up Action Cards without handicapping him. This is normally not a problem, as his deck is pretty strong, but it makes him unsuitable in Tag Duels, where both partners share the same field and Graveyard, thus his deck is very likely to get screwed by his partner or his partner is screwed for not using Spell/Trap Cards when they actually need them. Gongenzaka later gains a new ace monster that can banish Spell/Trap Cards from his Graveyard, yet it is still not suitable in Tag Duels.

  • One of ventriloquist Jeff Dunham's puppets is a goofy superhero wannabe named Melvin, who has no realistic powers to speak of, but is enthusiastic about it. He also has not one, but two weaknesses: cupcakes and porn — though not both at the same time, however, because he needs a free hand.

    Fan Works 
  • All Assorted Animorphs AUs: In "What if they had a chance to do it all over?", the Animorphs realize that Yeerks really are just slugs, so they can be killed with salt. They dump a massive amount of salt into the Yeerk Pool, and kill over one hundred thousand Yeerks.
  • Hetalia: Axis Powers fanfic Gankona, Unnachgiebig, Unità: Italy: super fast, great with swords, and able to accelerate and decelerate almost instantly without dying instantly or even being remotely harmed. It's his kindness that prevents him from fighting back against people who assault or make fun of him let alone conquer other countries. Not that Germany and Japan see this as a weakness.
  • In Power Girl fanfic A Force of Four, set in the Golden Age DC universe, the Amazons keep their initial weaknesses: they lose their powers if chained by a man and they are vulnerable at a spot on the backs of their heads. The villainous foursome exploits said weaknesses wantonly.
  • Several generations before the beginning of Superman story Superman of 2499: The Great Confrontation, sorceress Lady Hecate put a hex on the descendants of Superman and Supergirl so exposure to saltwater would kill them.
  • How do you defeat your own author? Well, if you're a character in You Got HaruhiRolled!, just show him a disgusting Doujinshi. He'll be so Squicked out that he will be unable to resist you forcing him back through the dimensional portal whence he came.
  • In Queen of All Oni, a Jackie Chan Adventures fanfic, Jade gains the weakness to onions Oni have in canon after EATING an Oni mask.
  • Because he is a Living Shadow, Mysterious from My Brave Pony: Starfleet Magic gets hurt by standing in any form of light.
  • In Christian Humber Reloaded, Vash, a God-Mode Sue with countless superpowers, multiple super modes, and an arsenal of high-tech and legendary weapons, who can take on entire armies and the main villains of several works of fiction without breaking a sweat, is vulnerable to Paralysis, a Useless Useful Spell in RPGs that rarely affects anything stronger than a common enemy.
  • When the Discworld had a brief and potentially deadly meeting with the Alien Queen, a very improbable Ripley — albeit one working for the Guild of Assassins — realised that a lifeform based on very strong acids could be vanquished by application of drain and toilet cleaner (very strong alkalines). As she put it, "simple alchemy: if the brute spits ph1 at me, then I'm jolly well going to respond with lots and lots of lovely ph14. Acid plus alkali equals salt and water, Captain Carrot. Any organic material subjected to caustic potash is reduced to soap. SHE is going to be a puddle of salty soapy water in no seconds nothing!"
  • In the Star Wars/Mass Effect crossover Origins, the "hibridium"-based cloaking devices aboard Trans-Galactic Republic and Republic Intelligence Service ships fail to conceal the ship's magnetic properties, meaning if one drops a strong enough magnet near the ship its presence will be revealed as said magnet is pulled toward the physically-invisible target. Aria T'Loak, never one for games, exploits this to blackmail RISE. It starts off okay but ultimately doesn't end well...
  • Vampires in My Immortal are vulnerable to steak. Early in the fic, the protagonist, herself a vampire, contemplates committing suicide with one she hides in her bedroom. Also, vampires are not only vulnerable to crosses, they apparently can't even write the word "cross." Of course, the story sometimes forgets all that and depicts vampires wearing cross earrings.
  • In Shinobi of the High Seas Kizaru has been beaten twice by using a mirror to reflect him away.
  • In Hope for the Heartless, water causes the Horned King severe burns. Snow causes that also if it melts on him. Diluted water (such as tea) burns him as easily as pure water, though not as severely. However, he seems to be able to digest wine.
  • In the Star Wars fan film Pink Five Strikes Back, Rebel pilot Stacy realizes that since the walkers attacking Hoth only had forward-facing guns, the Rebels could've just shot at them from behind. While being chased by a scout walker in The Return of Pink Five, Stacy remembers this train of thought in the nick of time - and causes the walker to lose its balance and crash by running in between its legs.
  • In Group of Weirdos, the Iron Knuckles are completely invincible, unless tag-teamed and attacked repeatedly by Link, the hero of time, and Ganondorf, a dark wizard with great power. Or you can just slash them a few times with a Deku Stick.
  • In Comes a Crossover Future Trunks is taken out by Principle Kuno with a shot from a Super Soaker filled with Pineapple. Turns out Trunks is allergic to Pineapples and never knew it, partly because he thinks that they are no longer around in his future. As a result he has a violent allergic reaction and needs to be rushed to a hospital because there are no epipens nearby.
  • This Bites!: Completely justified with Soundbite's weakness to salt; he is, after all, a snail. Also to a lesser degree, flour, as it completely clogs up his throat and renders him temporarily mute.
  • Naruto and anyone else with a darkness affinity in Black Flames Dance in the Wind: Rise of Naruto are weak against sunlight. Naruto's clones can't use their darkness affinity properly in sunlight for example. At night or indoors, they can change their forms on a whim but outside in the sun, they're just more durable Shadow Clones.
  • Eiga Sentai Scanranger might have not only the lamest but most exploitable example on this list. The blue-clad team member, who's empowered by comedy movies, is rendered powerless by swear words and toilet humor until his suit is specially modified so that reality becomes like a movie censored for TV for him. This evidently goes as far as to include imitations of the Tasmanian Devil, even!
  • Downplayed in A Dead World. Alex, being a virus, does not do well when exposed to alcohol, which kills viruses on contact. He also is not a fan of water, because even though it doesn't cause lasting harm, it apparently hurts. A lot. He also takes a great deal more pain from the Cloud than a human, Super Mutant, or ghoul would due to the fact that he doesn't technically have skin.
  • Hellsister Trilogy: Knowing Daxamites are fatally hyper-allergic to lead, Satan Girl plans to exterminate their race by scattering lead fragments all across the surface of Daxam.
  • In A Minor Variation, Rarity dismisses Tirek as a minimal threat due to him being apparently afraid of rainbows.
  • In the second-to-last story arc of Kara of Rokyn, Nasthalthia Luthor narrates the history of the feud between Superboy and her uncle Lex Luthor. Unsurprisingly, Lex devised every imaginable Kryptonite-based weapon in order to destroy Kal-El, including Kryptonite living beings.
  • Intentionally averted in Superman/Worm crossover The Last Daughter. Word of God stated he was avoiding stuff like Kryptonite, or red sunlight to hurt the main character.
  • In The Unfantastic Adventures of Bizarro No. 1, Bizarro-Martian Manhunter's weakness is human salive, as befitting the opposite duplicate of the pyrophobic Martian Manhunter.
  • The Vampire of Steel: Zol-Am is a Kryptonian vampire, so normal vampire weaknesses don't apply, forcing Buffy and the gang to obtain a piece of Kryptonite. Zol-Am is still vulnerable to stakes, though, provided that the stake is carved from a Kryptonian species of tree.
  • Fallout: Equestria: Littlepip finds evidence of one of the megaspells Twilight Sparkle created during the war, an epic defensive spell that could protect against any attack. The problem? It only works when it's sunny. Even in a world where the weather is created by ponies, that's a glaring flaw; the enemy could just wait until the ponies brought some rain clouds in and attack then. By the time of the story, the Pegasus Enclave keeps the Wasteland constantly covered in clouds, meaning it's never an option at all.
  • A New Jedi in an Old Republic:
    • The armies of the CIS are droids. Implacable, able to operate in vacuum, tireless... Too bad that Kyle has a directed EMP gun that he just turned over to the Republic for reverse-engineering.
    • The Jedi's empathic abilities are a great strength... Except that in battle against the droid armies, the only thing they'll be able to feel in the Force is the deaths of their friends and allies.
  • In Batman story Dance with the Demons, Catwoman gets shot with a poisoned dart, and Green Lantern's Power Ring can't extract the poison out of her body. Hal Jordan glumly reckons some of its components must be yellow-colored.
    The man in the green, black, and white costume focused the energy of his power ring on Selina Kyle's body. As before, he knew it would be enough to sustain life, but not to cure.
    Hal Jordan, the Green Lantern, knew that there had to be some yellow material in the poison that ravaged the former Catwoman. Even the ring had limits. It always would.
    Sometimes, those limits cost lives.

    Film — Animation 
  • The Mitchells vs. the Machines: The PAL Robots' main weakness is that they are unable to tell if Monchi is a dog, a pig, or a loaf of bread, and they'll short-circuit while trying to figure it out.
  • The Blue Meanies from Yellow Submarine are repelled by positivity in any form. This doesn't work out so badly, though, since their entire arsenal is built around the proliferation of depression and despair, but it does still leave them vulnerable to music.
  • This trope appears as a pastiche in Bolt. The titular dog believes he has superpowers because he never leaves the set of a TV show. When he is accidentally shipped across the country his powers "mysteriously" vanish, and he blames the Styrofoam packing peanuts he was shipped with.
  • Invoked by Syndrome in The Incredibles with the Omnidroid. It was built for an Engineered Heroics scheme, so he designed it to be nigh-invulnerable and unstoppable... to anything except the remote control that Syndrome wore on his wrist. It doesn't end well for him when the Omnidroid's adaptive A.I. adapts to cover for that weakness, but it does eventually allow the heroes to win, after a period of desperately playing keep-away while the Omnidroid attempted to destroy the remote.
  • Megamind has Metro Man having a weakness to copper, which causes Megamind to kill him without even meaning to. (Except that he actually made it up in order to fake his death and retire.) This is even lampshaded by Megamind:
    Megamind: Your weakness is copper!? You're kidding, right?
  • Stitch of Lilo & Stitch is speedy, clever, and able to lift 3000 times his own size, but still has comedic weaknesses:
    • He is too heavy to swim. One reason falling in water is so damaging is that Stitch tends to panic when he's underwater. He eventually starts to handle deep water better; one episode of Lilo & Stitch: The Series (the theme of which was conquering your fears) had him fall into a swimming pool, but he manages to keep calm, hold his breath, and climb out without issue.
    • He might be able to lift 3000 times his own size, but not an ounce more. Gantu was able to have a pile of stuff crush Stitch by placing a feather on it.
  • The King and I has this in the form of every single solitary minion the Big Bad conjures up. His first pair of minions are giant traditional Chinese dragons who ruthlessly attack the teacher's ship to the point that it's near sinking. How are they defeated? Whistling. Everyone aboard whistles a happy tune and they dissolve into nothingness.
  • In The Princess and the Goblin, the goblins have two weaknesses: really squishy feet (the Queen wears stone shoes) and singing. They freak out when they hear people sing. At least it's a nice song.
  • In the 1973 Russian version of The Nutcracker, the evil mice explode if they sneeze, so any sneeze-inducing substance is deadly to them. In the Nutcracker Prince's backstory, his father the King defeats the Mouse Queen by dousing her with pepper.

    Film — Live-Action 
  • The Wizard of Oz gives the trope-codifying example: the Wicked Witch of the West melted when Dorothy splashed her with a bucket of water.
  • Return to Oz continues the proud tradition of Oz villains having an unexpected, thorough weakness that kills them on the spot. In this case, the Nome King (and seemingly Nomes in general) find regular chicken eggs to be extremely poisonous. All of them react to Dorothy bringing a chicken along like she had an armed bomb with her, and when the King accidentally ingests one of its eggs he dies (and falls apart) within the minute.
  • A Nightmare on Elm Street: Freddy Krueger, the nigh-unstoppable humanoid monster that can kill you in your dreams, has a weakness to people not believing in him. This becomes far funnier when you realise that his weakness is the same as Tinkerbell!
  • In the Affectionate Parody superhero movie Surge of Power: The Stuff of Heroes, both the hero and villain have their powers nullified by the presence of peppy music. Fortunately the hero is able to save the day with his incredible accuracy with slingshots.
  • The aliens in Signs. It's hard to feel threatened (retrospectively) by creatures which will dissolve in an April shower or corrode in a particularly humid breeze. And are completely incapable of breaking down wooden doors.
  • In Shyamalan's earlier film, Unbreakable, water is also used as a weakness for the main superhero character. In that case, though, it isn't that he is especially vulnerable to water, but rather he is just as susceptible to drowning as a normal person. If he drinks something too quickly, he will choke and if he is submerged he will succumb to drowning just like everyone else — though it was theorized that the dense bone and muscle that make him unbreakable also make him unfloatable (or the character simply can't swim). There is a complicating factor in the scene where he ends up almost drowning in a swimming pool: he's tangled up in a big piece of fabric, which would give anyone a bad time while in water. It is also a psychological weakness: he had almost drowned once as a child (probably due to the aforementioned bone density), an event so traumatic he blocked it from his memory. That would make anyone nervous around water, even if they couldn't remember why.
  • Shyamalan probably got the weakness idea for Signs from Invasion of the Saucer Men, whose aliens were melted by light. There is nothing lamer. Especially considering they were done in by the headlights of teenage hot rodders!
  • The Bioraptors (also called "Demons") of Pitch Black has a similar weakness to light. Though this actually works, as most of the movie is during a solar eclipse and they broke their flashlights. Oddly enough, the creatures are shown moving about in the light, albeit cautiously, before the eclipse. Compare this to later on, when a lighter is enough to make them run away...
  • The weakness to light appeared in Attack of the Eye Creatures (because it was an almost word-for-word remake of Invasion of the Saucer Men).
  • Also happens in The Mole People, in which a lost colony of ancient Sumerians living Beneath the Earth had adapted to their lightless conditions to the point where our heroes can kill them with a flashlight.
  • In The Day of the Triffids, the title monsters are melted by sea water. Nearly as lame. In the original novel, ironically, flame-throwers are among the most effective anti-Triffid weapons.
  • The Tenctonese in Alien Nation (the movie as well as the series) are harmed by salt water. Seawater is like acid to them. They live mostly on the Californian coast; while they do develop a tolerance to it, direct exposure is still harmful to them. There is a slightly funny moment when the police find the partially-dissolved body of a Newcomer washed up on the beach. When asked how they were able to identify him, they simply shrug and show his soaked wallet. All his clothes were, naturally, fine too.
  • In the Disney Channel movie Up, Up and Away!, the weakness of the superhero family is aluminum foil. However, it's never made clear if it was just their family or all supers who are vulnerable to foil. Both Spider-Man and Superman are mentioned to exist in this 'verse, and they don't have any weakness to aluminum foil (although Supes has his own weakness). The bad guys definitely assume that all supers have this weakness, as, when Randy claims to have powers, they give him some foil to test it.
  • In SYNGENOR, the title creatures were created to be the perfect soldiers for a war with the Middle East. They don't need to eat or sleep, are immune to most weaponry, and reproduce every twenty-four hours. Their only weakness? Water is like acid to them. It's somewhat hard to be afraid of a super soldier that can be defeated with a super soaker. Or, if worst came to worst, by peeing on them.
  • In the Dead Gentlemen Productions (of The Gamers fame) running Demon Hunters series, Duamerthrax the Indestructible is a walking brick that is, well, all but indestructible. He's an "earthwalker", a demon said to have been kicked out of hell for being too mean. Unlike other monsters and demons in the mythos, he's not susceptible to ordinary injury. He can eat the round of a large-caliber revolver jammed in his mouth ("Mmm! Nice 'n' leady!") casually regrows limbs after being dismembered, and generally shrugs off what few injuries he even takes while making terrible puns. So what's the convenient balance? We're told that every earthwalker has a weakness to some substance, "a plant, metal, anything". Duamerthrax's turns out to be mint. Being shot repeatedly at close range with numerous handguns does little more than inconvenience him, but the breath of someone having just used breath spray causes him intense pain, water-guns full of mouthwash can inflict serious harm and mint dental floss can do even worse things. Ultimately subverted; he turns out to have faked his defeat when the body count got where he needed it, regenerated almost immediately, and the credits show him happily dancing away. Then he gets hit by a car and sent back to hell in the beginning of the second movie.
  • Mars Attacks!. The Martians' weakness is hearing high-pitched yodeling, such as in the song "Indian Love Call" by Slim Whitman, which causes their heads to explode.
  • The Tomatoes in Attack of the Killer Tomatoes! have the same weakness, in the form of a song called "Puberty Love".
  • The Mummy (1999): Imhotep in his incomplete form is immediately chased away when a cat is in his presence, because they guard the Underworld. Naturally, the heroes never do anything to exploit this weakness, such as by putting cats in the room full of the people he needs to kill to stop being vulnerable to cats.
  • From 1966 superhero parody Rat Pfink A Boo Boo: "Remember, Boo Boo, we have only one weakness... bullets."
  • Like the Dalek example given below, in RoboCop (1987), the killer robot ED-209 chasing the title character is taken out of play simply by trying to chase RoboCop down stairs that its chicken-walker legs are ill-suited to negotiate. Somewhat justified in that the ED-209 is just meant to look intimidating and get bought up by the military, not to do real police work.
  • In an Homage to The Wizard of Oz, Death in Six String Samurai is killed when squirted with water.
  • Derek Zoolander can't turn left until his Big Damn Heroes moment. (Though continuity nitpicks will note that he does turn left (relative to himself, though not the camera) while in disguise while trying to retrieve Maury's computer.)
  • The Spiderwick Chronicles provides a literal weaksauce weakness: Tomato sauce is corrosive to goblins. (This was not in the original book.)
  • Mystery Men: Invisible Boy's weakness is anybody looking at him while he is invisible. (Machines, like motion detectors and cameras, don't trigger this.)
  • The Super Cop in Super Fuzz has super speed, super strength, invulnerability, telekinesis and so on, but he completely loses his powers when he sees the color red (probably a nod to Green Lantern and his vulnerability to yellow): a red traffic light, a red flower, a red ribbon, and he's harmless.
  • The Psychlo homeworld of Battlefield Earth can be blown to (relatively) tiny bits with a nuclear explosion. You'd think that a nuclear bomb is substantial enough to bypass the Weaksauce bit, but remember that this is a PLANET. It'd be like a human exploding in a smear of gore after stubbing their toe. The given reason is that the planet's atmosphere ignites upon the slightest exposure to radiation. This, of course, implies that the planet completely lacks any heavy elements and has an insane set of Van Allen belts to protect it from any stellar radiation.
  • Sleepwalkers has monsters that are Made of Iron, except when scratched by house cats.
  • As is the usual with horror movie monsters, the 1973 Blaxploitation movie titular character Blackenstein was Immune to Bullets, fists, and blunt objects — traits which, when added to his Super Strength, seemingly made him all but unstoppable. What is it that finally laid the mighty monster low? The primal forces of nature themselves or divine intervention? No. The police sicced the hounds on him. That's it. Doberman Pinscher fangs trump bullets, apparently.
  • Mad Max: Beyond Thunderdome: Blaster is the immense Dragon to Master. According to people who want him dead and have been hunting for the right assassin to get the job done, "He can kill most men with his breath." His weakness: he can't stand high pitched noises. Max discovers this when the car alarm on his vehicle renders Blaster into a writhing, screaming, mess — and promptly figures out that his whistle can have the same effect. Not a surprise, given that this is a common problem for people with Down's Syndrome.
  • The undead mutant warrior things from The '80s flick Neon Maniacs are virtually invulnerable except, like many other things on this list, they can be dissolved with a squirt gun.
  • The goblins from Troll 2 are defeated when Joshua eats a double-decker bologna sandwich in front of them during the film's climax. They can't come within 20 feet of you after you eat 2 bites of bologna.
  • In Ernest Scared Stupid, what's scaring Ernest so much are a variety of trolls who, legend has it, are vulnerable to... milk.
  • In The Lair of the White Worm, a vampire's natural enemy is the mongoose due to vampires in this universe being snake-people. The mongoose ends up getting killed anyway but it's still enough to make the Big Bad retreat for a while. Also, playing the bagpipes puts them in a trance. Unless they have earplugs.
  • In Hook, the Lost Boys exploit Captain Hook's fear of the sound of ticking clocks, which they attribute to Hook's memories of being pursued by a clock-swallowing giant crocodile. Subverted when Peter points out that Hook can't really be afraid of the crocodile, which he killed years ago; rather, Hook is afraid of time, as he's become an old man beneath his wig and make-up, and old age is hardly a fear that can be dismissed as Weaksauce.
  • Superman IV: The Quest for Peace brings us the horror that is Nuclear Man who, for reasons unknown, is powered solely by the sun. The minute he is out of direct sunlight he stops dead. Even if he's in a well lit room but slightly in the shade, he's next to worthless. This is especially pathetic when you consider that, in canon, Superman's own powers are ultimately derived from sunlight, but he doesn't power down in the shade — at least not unless he has to use his powers a lot before the next time he can catch some rays.
  • In The Traveler, the only way to counter Mr. Nobody is actually by letting him hear his real full name , which will make him lose powers and become vulnerable to physical attacks. Kinda makes sense for him to conceal his identity throughout the film.
  • Played for laughs in Evolution, where the aliens' critical weakness is to selenium, the best local source of which is in dandruff shampoo.
  • Hancock's only weakness? His real wife. Any attempt to live a loving, fulfilling life with his wife of 3,000 years will cause them to both become mortal in order to die together. Unfortunately, Hancock has a hero complex to save people, which attracts bad guys who attack them in their weakened state. They argue, he leaves, they meet again and the whole cycle starts again. His wife says the gods who created them gave this as a gift. So that they could find love and be happy, and not have to see everyone they care about die as they remain unchanged and alive.
  • R.O.T.O.R. is about a robotic policeman gone mad. He's almost unstoppable except for being paralyzed by loud noises. This might not sound that dumb, until you witness him repeatedly frozen by people honking their car horns at him or playing a radio a little too loud.
  • The Sensory Overload to the Kryptonians in Man of Steel. Good thing Supes learned how to control it and unfortunately, so did Zod.
  • Marcus Wright in Terminator Salvation is every bit as tough and unstoppable as you would expect from a terminator... except for his glaring exposed weakpoint in the form of his organic human heart (which isn't even covered with any sort of armor; it just hangs there in a big gaping hole in his chest, leaving it completely exposed to any stray pistol shot or well-aimed punch).
  • Godzilla:
    • In Godzilla (2014), Godzilla's arms are very stubby compared to the rest of him. The male M.U.T.O took advantage of this a couple of times by jumping on his head and stabbing away at him with those long forelegs, with Godzilla having an extremely difficult time dislodging him since he could barely touch the top of his head. They are plenty strong, though, and he uses them to fight the female Muto.
    • King Ghidorah in Godzilla: King of the Monsters (2019) is a nigh-unstoppable living extinction event whose very wing-flaps create hurricanes. His notable weakness? The same enormous wings that grant him superpowered flight also make him incredibly ungainly in water, rendering him almost entirely defenceless when Godzilla drags him into the ocean.
  • The titular Nightmare Man is a pretty powerful fertility god, he can kill people, grab and crush people's hearts by sticking his hand in, control dead people as puppets, etc. His weakness, if the person he's possessed is on anti-psychotic pills he can't do anything at all.
  • The aliens in the French comedy Le Gendarme et les extra-terrestres are physically tough, can teleport, and can appear as any person they desire. What's their weakness? Water (note: the film predates Signs by a few decades). Apparently, they're Mechanical Lifeforms (they're shown drinking motor oil at one point) and rust at the slightest touch of water in a matter of minutes. The worst part? They came in peace! It was the gendarmes' aggressiveness that made them hostile. In the end, the aliens are destroyed (with water, naturally), and the gendarmes are hailed as heroes.
  • Even though Thor is the God of Thunder and has the power of Shock and Awe, he's still vulnerable to electric attacks from others, as we see in Thor: Ragnarok.
  • In The Thing (1982), the titular monster's assimilation powers only have one big flaw; it acquires the weaknesses of its victims alongside their strengths. When it assimilates Norris, it unwittingly copies the heart condition he suffers from, which leads to it having a heart attack during a stressful moment. Things go From Bad to Worse when the rest of the team tries to resuscitate "Norris" with a defibrillator, forcing the Thing to transform and blow its cover in order to stop the painful electric shocks.
  • The playable characters in Jumanji: Welcome to the Jungle all have lists of strengths and weaknesses. Some weaknesses, like Ruby’s weakness to venom, make sense, but others, like Mouse exploding if he takes one bite of cake, are just silly.
  • In Night of the Demons (2009), the demons are vulnerable to rust.
  • Monty Python and the Holy Grail: The Knights Who Say "Ni!" are sent into unbearable pain upon hearing the word "it".
  • Hungerford: The bugs don't like body spray. If a mind-controlled human host is sprayed, they'll fall to the ground, clutching their faces, and then the bug will leap out of their neck.
  • Peelers: The infected can be killed with water. The apparent logic behind this is because the two substances are as incompatible as oil and water.
  • Black Sheep (2007): The were-sheep are horrible monsters. But they're mentally still sheep, so a single sheepdog is enough to contain them.

  • The Darklords of the Lone Wolf gamebooks are (were, as of Book 12) crippled by clean air and can only unleash their full strength in toxic habitats. Half the reason they waged a centuries-long campaign ruining Magnamund (the other half being that they are Always Chaotic Evil embodiments of evil) is (was) to make the world a paradise for themselves. Even in their weakened state they can still put up a good fight with their mastery of Black Magic and immunity to conventional weapons. In one story arc, the Darklords develop a magical engine that allow them to retain their full strength outside their realm. About a dozen of them are on the frontlines of their war when the protagonist smashes the engine, singlehandedly ending their reign of terror.

    Myths & Religion 
  • The Bible:
    • Judges 1:19 is often taken by unbelievers and skeptics to argue that iron chariots are a weakness of God; as the King James Version translates it, it reads "And the Lord was with Judah; and he drave out the inhabitants of the mountain; but could not drive out the inhabitants of the valley, because they had chariots of iron." Needless to say, this interpretation is not generally accepted by believers, particularly since the iron chariot was a mighty weapon in that era.
    • The great Samson got his Super Strength from Nazirite rituals (not cutting your hair, taking alcohol, or touching the dead), and breaking them was his big weakness. He attempted to mask this by making up a bunch of equally weaksauce fake weaknesses, only to kill anyone who actually tried them. He was still stupid enough to tell his true weakness to Delilah, despite her being the only one who knew of his "weaknesses" and therefore the only one who could have told them to his enemies. By the time he'd cut his hair he'd already violated other parts of the Nazirite rituals, such as drinking alcohol, and handling dead bodies. Cutting his hair was the last straw, so to speak.
    • Considering that Samson continued consorting with Delilah long after she'd made it ridiculously obvious that she was committed to selling him out to the Philistines, and even told her his real weakness, it could be argued that his worst Weaksauce Weakness was pretty women.
    • Some scholars believe Samson is in fact an Expy of an earlier Hebrew Sun God, and that his long blond hair was symbolic of the sun's rays/corona. Hence, cutting it off took away his powers.
  • Norse Mythology: When Baldr/Balder/Baldur, the son of Odin, was born, his mother Frigg made all living things vow not to be able to hurt him. The only living thing that didn't make this promise was mistletoe, as she felt it was too young to be bound to such a promise, and so it alone would be fatal to him. The gods made a game of it, throwing random items at Baldr and amusing themselves by watching the projectiles deliberately avoid striking him. Loki, the trickster god, deceived her so that she would reveal this weakness. He acquired some mistletoe and brought it to the blind god Hodr/Hoder/Hodur, telling him that he should also get to participate in the gods' fun little game; of course, when the mistletoe struck Baldur, it killed him. Baldur's death was the start of the chain of events that led to Ragnarok,
  • Vampires:
    • The badass creatures of the night who always want to suck your blood, tend to have a lot of weaknesses. Popular tradition holds that you're fine as long as you stay in the sunlight, have some garlic, stay inside your house and refuse to let them in, or even wield a simple cross. Then there's the older, more obscure, and even more restrictive weaknesses such as inability to cross running water or the inability to stand constant bell ringing (related to church bells). One of the worst is a compulsion to count small objects, enabling anyone to stop them with a handful of grain. Pretty much the only traditional weakness of vampires that's not weaksauce is the whole wooden stake bit, since getting stabbed through the heart with a pointy stick kills most things.
    • The multitude of fiction involving vampires, though, has led to a multitude of differing weaknesses — including varying degrees of effectiveness. In some settings, vampires are weak to silver, and other religious symbols affect them as much as Christian ones. One that has appeared in modern media is what the now-defunct Gamer Jargon website called the "cheesecloth ribcage", where a vampire can be killed with any half-hearted stab at the chest with a wooden object. The site cited Buffy the Vampire Slayer and From Dusk Till Dawn as the worst offenders. On the inverse, many of the works that tend toward "non-standard" portrayals of vampires also go at length to mock the traditional weaknesses.
  • The Fair Folk are terror-inducing beings of legend and myth, often full-on Reality Warpers... and yet, they can be beaten by a stick of iron, a horseshoe, a length of rowan wood, clothes worn inside-out, or a stick of bread. A popular explanation for the weakness comes from Victorian Era archaeologists, who held that this is all just symbolism for the bronze and stone-working cultures being conquered by iron-working ones. Later academics (like Dr. Diane Purkiss) have shown there's no archaeological or historical evidence for this.
    • This is an especially big problem for the Nuckelavee of Orcadian folklore. Widely considered the most malevolent elf in all of Scotland, the Nuckelavee is an eldritch horror that resembles a man on horseback, if the man was fused to the horse and both had all their skin flayed off. It rides through the countryside destroying crops, killing travelers, causing floods and plagues and generally being a harbinger for all things bad. How do you defeat this monstrosity? Fresh water, and burning seaweed. The Nucklavee fears freshwater, so much so that it cannot cross a stream, and hides in its oceanic lair during the winter storms. Likewise, it finds the smell of burning seaweed intolerably offensive. However, don't provoke the Nucklavee, especially with taunting or burning seaweed, as whenever the Nucklavee is offended, it tries to kill all of the horses in the Orkneys with a hideous disease called "Mortasheen".
    • The Irish/Celtic Dullahan, a fearsome headless fairy that rides at night (either alone or accompanied by banshees) to splash buckets of blood into people's faces — to announce the recipient of a face-full will soon die. They're also a mean shot with a whip, and sometimes drive horse-drawn carriages decorated with human skulls and femurs. There's no known way to actually kill a Dullahan, and the only way to ward one off is to exploit its intense fear of... gold. That's right; the Dullahan, possibly one of the most pants-wettingly scary portents of imminent death, can easily be warded off by one of the metals most commonly used to make jewelry.
  • Werewolves have their share of weaknesses, too; earlier legends provide ones such as having an iron bar thrown over their head — although hitting somebody with an iron bar is pretty incapacitating for most creatures — drawing three drops of blood, or having their name announced one to three times. The popular weakness to silver weapons is a relatively new invention. It often comes with an immunity to anything not made of silver. Most werewolves that don't have the silver weakness can be killed by any type of weapon, including silver. There is even at least one myth were a werewolf can be forced to return to their human form simply by scolding them.
  • Basilisks. Okay, they can kill you if you look directly at them, or hear their voice, or if you touch them, or it breaths on you, but guess what? They can be killed instantly by the crowing of a rooster, and their powers don't work on weasels.note  In some legends, Basilisks are also weak to themselves. There are stories of men killing a basilisk by wearing mirrors sewn into clothing.
  • Trolls. Yeah, they can rip you limb from limb with their bare hands, but a little sunlight turns 'em into inanimate rocks. One good way to trick a troll into watching the sunrise is to challenge them to a game of riddles: no troll can resist such a challenge. But beware: according to the legends trolls are extremely good at riddles, and if you decide to give up before dawn then they celebrate their victory by eating the loser.
  • Many of the oldest portrayals of Satan, the ostensible antagonist to God, has him easily outwitted by peasants and driven away by holy symbols (such as a scapular).
  • Achilles was the greatest of the Greek Heroes. When he was born, his mother dipped his body in the river Styx (or into a fire, depending on which version of the story it is) so that he would be invincible. The only part of him that wasn't affected was his heel, which was where she held him. Given that the trope Achilles' Heel is named after him, you can guess what happened to him eventually. However, some of the myths indicate that he was shot with arrows poisoned with hydra venom, the same ones that killed Hercules, which deflects the weaksauce bit.
  • In folk tradition, salt is often used to repel evil. It was said a circle of salt could protect one from witches, that salt over your doorstep would ward off ghosts and evil spirit. Salt was often seen as a symbol of purity, especially in its uses: Salt is a conservation agent after all, and salt-cured meats don't spoil. Salt as a purifier appears in Shinto (Where it is used as a ritual purifier and small mounds of salt can be used to repel evil spirits) and Christianity (where it is used before mass and to consecrate a church).
  • In Arabic legend, a ghoul could be killed with a single kick. However, there's a flip side: kick the ghoul again and it immediately springs back to life.
  • Japanese Mythology:
    • Kappa are river goblins ranging from mischievous to outright malicious who are said to kidnap children to drown them or tear out their souls and livers. They have a dent in their skulls in which they store water, allowing them to walk on land. Despite their violence, kappa are extremely well-mannered and cannot resist answering a polite bow with an even deeper one. This will cause the water to spill from their heads, forcing them to retreat. Additionally, they love cucumbers even more than children and can easily be distracted with them.
    • The Omukade, a giant venomous centipede, has an extremely weaksauce weakness, human spit.

  • In Monster Bash, you can collect items (bombs) that can be used during each monster, such as garlic for Dracula or a Silver Bullet for the Wolf Man. The Bride of Frankenstein's weakness is a hair dryer.

  • Mission to Zyxx has the K'hekk, an insect race dreaded for their militaristic expansion and gruesome reproduction by laying eggs in living hosts. They flee because Dar is running a fever that day.

    Tabletop Games 
  • In Heavy Gear the advanced Black Mamba Gear — one of the more powerful designs in either of the two superpowers' armies — had exceptionally weak rear armour. The result is that Black Mambas could be (and routinely were in gameplay) easily defeated by lightweight Cheetah scout Gears. While the fluff text initially ignored this, the game's designers eventually acknowledged and lampshaded this weakness by having Mamba pilots clamoring for a solution to the "glassback" problem.
  • Hero System; Most of the monsters in Lucha Libre Hero take extra damage from lucha combat maneuvers. And since the PCs are by default technico luchadors, there's a lot of these showing up in the fight scenes. But then, the sourcebook was inspired by Mexican lucha films, and "every problem can be solved with a good wrestling hold" was standard in those films.
  • In GURPS, the disadvantage Supersensitive makes having any other sort of sentient creature with 20 meters a serious weakness. With Combat Paralysis your greatest weakness is being put in any sort of danger. Naturally such disadvantages are not recommended for Player Characters.
  • d20 Modern has a table of random weaknesses... including some really stupid ones, such as: Clowns, the number 8, math, and books written by William Blake.
  • In The Dresden Files RPG, all creatures who take some sort of supernatural toughness, regeneration, or physical immunity must take something called "The Catch", which, when used against them, will bypass their ability to shrug off damage. The more common/easily accessible and known the material(s) needed to fulfill "The Catch" is, the more points you can rebate. So, fairly unique Catches like "Swords Of The Cross", "Wizards Born Under Special Circumstances", "Soulfire", and "Nuclear Detonations" won't reduce the point costs for the power(s), while more common and known substances (like iron vs Fey, holy items vs Black Court Vampires, or physical attacks like a brick loaded sock against a magically immune creature) will give you back more points to potentially work with.
  • In Deadlands, there are some creatures and villains who are immune to anything except one weakness. For example, a Hangin' Judge is vulnerable to a weapon held by a legitimate lawman on duty, a Tummy Twister to hot chili peppers, and Jasper Stone to suicide. That last one is technically correct, but it's so much more. The conditions are actually "Stone can only be killed by a gun fired by his own stone-cold hands", so suicide counts... but so would redirecting his shot before it hit its target. So would having Young Stone and Old Stone shoot each other.
  • Changeling: The Lost has the concept of "frailties", little weaknesses that certain fae (and overly-powerful changelings) are prey to. Some of them are the classic faerie weaknesses, others can be as odd as "must drink alcohol instead of water" or "cannot cross lines of ants". The only universal weakness is iron, which isn't as dangerous as you think because pure iron is rare... and steel does nothing. These weaknesses differ from subject to subject; the fiction for one book has a Genre Savvy mortal invoking every bane she knows from the old tales in an attempt to scare off one of the Gentry. None of them work.
  • In Rifts, vampires have all the "classic" weaknesses found in folklore; crosses, garlic, wooden stakes, sunlight, as well as a couple usually attributed to other monsters (wolfsbane, silver). One weakness that's rather unique to Rifts, and the most weaksauce of all, is running water, in any form. Which means a vampire that can shrug off nuclear detonations and hails of rail gun bullets can be taken down by a squirt gun. Do bear in mind, however, that this is After the End, so getting that squirt gun is not nearly as easy as visiting a toy store.
  • It's possible to give a character in Champions such a weakness via the Susceptibility Disadvantage. Water, for example, could be worth quite a few points depending on how many dice the character takes from it since it's one of the most common substances in practically any game world. This would make it impossible for your character to do such simple things as bathe or shower, and any kid armed with a Super-Soaker and/or a bucket of water balloons would become a credible threat.
  • In Magic: The Gathering, the reason that most large creatures ultimately fall under Awesome, but Impractical is because they can easily be dealt with using simple, cheap, and ubiquitous removal spells. A great specific example is Marit Lage, an ancient Eldritch Abomination summoned from Dark Depths who, at 20/20, is capable of killing a planeswalker in a single hit, requires 30 mana to summon under normal circumstances, and cannot be destroyed by anything, can be undone with a single one-mana Unsummon (being a token instead of a card, returning it to its owner's hand instead causes it to cease to exist). For this reason, a lot of powerful creatures come with abilities to get around this, such as hexproof (cannot be targeted by opponent) and the inferior shroud (cannot be targeted by anyone, not even its controller) and ward (opponent needs to pay an extra cost, usually more mana, to target the creature).
  • Anything in Bleak World with the water weakness is going to be this, as such vampires can go out in neither sunlight or rain. Don't even get us started on the GM who decides to put the MacGuffin at the bottom of a lake.
  • In Munchkin, a Limburger Sandwich is a +3 item that also gives an instant victory against the Floating Nose.
  • Exalted: Lands of Creation describes the Adamant Oriole Sanctuary, a country filled with many species of songbird. If all the birds ever go silent, the Primordial that sleeps beneath the land will wake up and destroy it.
  • The various "Van Richten's Guide to..." books from the Ravenloft setting show that finding and exploiting these is Van Richten's favored strategy. Considering how dangerous Ravenloft monsters tend to be, it's generally good advice.

  • In Gian-Carlo Menotti's opera Help, Help, the Globolinks, the invading Globolinks are repelled by music.

    Web Animation 
  • Eddsworld: In one of the early Christmas specials Edd is saved form death when he finds the Grim Reaper's one weakness: Gravy.
  • ASDF Movie: "Kitten Fight!" "No wait, I'm allergic to adorableness!"
  • Tonin: After being made indestructible, Vilano-san is told to avoid dairy. He doesn't understand the full implications behind the warning until the hero hits him with a hunk of cheese during Season 1's climax. During Season 4, one of his sons tries to obtain that same power in spite of knowing that weakness comes with the package.
  • In the second season of XIN, Dimir seems to be an unstoppable combatant. When the eponymous hero realizes he has weak stamina and restricts his movements to conserve it, he's beaten like a red-headed stepchild.
  • DSBT InsaniT: Not only does Stephanie's Mind-Control Music only work on males, but if anyone gets a hold of her mic, her songs can be used against her.
  • Sock Series: How to keep an eldritch demon's powers in check? A plastic hamster cage, as its powers cannot affect plastic, no matter how powerful they are.

  • Cheshire Crossing (by the creators of Casey and Andy) delves into the weakness from The Wizard of Oz: The Wicked Witch of the West explains that all witches are vulnerable to water (while in Oz, at least)—she was keeping the water on hand should Glinda the Good Witch launch a surprise attack. (In a later scene, the bucket is labeled "In case of Glinda".) She just never expected her enemy to bully a little girl into doing the deed.
  • Another spoof of The Wizard of Oz comes from Magicians & Munchkins; the Wicked Witch simply took this disadvantage to get a few additional levels in magic.
  • It's more of a tribute than a spoof, but in Namesake, the Wicked Warlock of the West has the exact same weakness as his predecessor.
  • Toothgnip the goat in Goats gets his Kavorka Man powers from "The Panties of Potency". This had nothing to do with the artist having trouble drawing Toothgnip standing on all fours, honest!
  • Parodied in this strip of The Order of the Stick, where, since Haley always has her sandwiches without pickles, Crystal thinks they're toxic to her. They're not.
  • In one Bob the Angry Flower strip, Bob thinks that a superhero has the Weaksauce Weakness of bacon. He turns out to be wrong, but we never find out what the weakness actually is.
    • Another one has Bob running a hot peanuts stand, recognizing a customer and his friends as a band of supervillains, and instantly and correctly deducing that they are actually buying ammunition for an attack on Anaphylactic Man's fortress. (He sells it to them anyway.)
    • Yet another has Bob defeating an evil skeleton with the obscure knowledge that skeletons have a fatal weakness to raisins. Yeah, it's that kind of comic.
  • This episode of Dinosaur Comics claims to have been inspired by this trope. More specifically, it's about the dangers of peanut allergies, orange juice, and the water that takes up 70% of the earth's surface.
  • Tales of the Questor subverts this with the fey. General belief is that they are vulnerable to "Cold iron" but this proves to be false. Research into why the iron did not work reveals that the ancient documents that the information was obtained from were actually misprinted versions found in an ancient garbage dump and that the symbol for cold and the symbol for north are very similar. Turns out the weakness is not cold iron but "north seeking iron" (lodestone), they are vulnerable to strong magnetic fields. Unfortunately only the weakest fey have this vulnerability, the strong ones can shrug it off (though with immense pain).
  • Bob and George: Tomahawk Man is lethally allergic to Plant Shield, something Mega Man considers to be the crummiest power in the series. However, what really takes the cake is Ran Mark II, a monstrosity so intimidating it makes Bob virtually shit his pants. However, he is vulnerable to one of the most common substances in the Bob and George setting: Ran Mk I corpses. Bob, a demigod of fire, is flat fucking terrified of Pokémon.
  • In Goblins: Life Through Their Eyes, Klik, a sentient metallic being able to fly, morph into anything, and absorb genetic information from flesh-based life-forms, is corroded when coming into contact with blood.
    • The website explains later that every Klik has a plus, a substance that heals them, and a minus, which is something that harms them, which are different for each Klik.
  • In Sequential Art, the Denizens (little black shadow creatures) are dependent on their leader when they try to conquer the Earth. When he is killed, they just mill around the house, helping out or watching soap operas. And this leader can brandish a chainsaw, but just like the rest of them was small enough to be placed in a drinking glass and thrown out a window. Also, apparently Kat's evil former teacher's life is somehow linked to the ruler she waves at her students while yelling at them. When Kat breaks it in a fit of anger, the teacher has a heart attack and dies. And There Was Much Rejoicing.
  • This trope and the classic superhero Twinkie advertisements are brilliantly parodied in this Super Stupor comic.
  • Sluggy Freelance:
    • At one point, the bad guys have robotic water-coolers that short circuit on contact with water. Yeah, someone really didn't think that one through.
    • There is an alien race that is nigh-invulnerable to anything except nerf guns, which to them are a dangerous weapon. With Santa being a toy manufacturer, they mistake him for a weapons provider and move against him as their first strike for an alien invasion.
    • The Evil, a litter of kittens made invincible, bloodthirsty fiends by Satan still suffer the psychological limitations of being kittens: give them milk, balls of string, or some toy mice, and they'll be too distracted and contented to murder you.
    • The demons of the Dimension of Pain can't stand the smell of flowers. This means that they can't enter the sewers in the Dimension of Lame, that place being a real Sugar Bowl.
    • It turns out that, in addition to some normal vampire weaknesses, Vrykolakas vampires turn to ash when exposed to too much stupidity. That only comes up after Sam becomes their king, though.
  • In A Girl and Her Fed, the agents with the Pocket President chip installed get incapacitating migraines when exposed to really bright light. It's why they all wear the Cool Shades.
  • Charby the Vampirate: "Classic" vampires have all the classic weaknesses of the vampires, while "elites" possess none of the weaknesses, save one... Obsessive Compulsive Disorder. If they come across a pile of identical objects (a pile of rice, beans, the beads from a woman's dress that had accidentally come apart), they have to count it, regardless of the circumstances. For classic vampires, this can cause them to count until the sun comes up, and they die. For elites, trying to use this on them just ends up pissing them off, since the sun has no effect on them.
    • And Elites can still go around that with mathematics: Charby is seen weighting both a small sample and the whole heap on pocket scales, and deducing the total number from the sample size.
  • Liz's beast-man of a boss in Dead Winter whom fought in Vietnam, yet is still able to take on Monday pretty effectively due to his sheer giganticness and indestructibility. Monday stabs him in the shoulder, kicks him in a certain area, etc. but never really fazes him; the heroes end up smashing him in the head with a metal pole attached to a fast-moving car, but this only stuns him temporarily. His weakness? Germs—the imaginary kind. He's such a hypochondriac that slapping him in the face with a dirty mop will give him a panic attack. He gets over his fear of zombie infection pretty quickly, though...
  • Axe Cop's weakness is being surprised. He melts. And his second weakness is cherry rainbow.
  • Sydney in Grrl Power has seven orbs that grant her powers. But she has to hold an orb in her hand to use it, so she can only run two powers at a time. When asked what her weakness is, she said:
    Sydney: So yeah. Mittens are my kryptonite.
  • The robots in Gunnerkrigg Court have the strength and speed of a machine, and some are safe even against Kat's electro-disruptor. But they have a big red button on top of their heads. Yep, they have a large, highly visible, easy-to-reach off switch.
  • In Rusty and Co.
  • In Eldritch (2009), while most Eldritch wolves are allergic to silver, any bullet in the heart or head would do them in just as easily.
  • In Nodwick, the Evil Sorcerer Ildomir went to a school for wizards called the Heractium Dark Arts Academy, where teachers punished students with a song called "I Write the Spells" (a Song Parody of the pop classic I Write the Songs) which also made them more evil. Unfortunately, this punishment was too much for Ildomir, and ever since, simply hearing the song would drive him to the brink of madness.
  • In El Goonish Shive, the fire-summon mooks have a weakness to water, despite not actually being on fire. Trying to make flaming creatures with a summon spell that can't allow it (the creatures would incinerate themselves) causes the effect.
  • In DNA, Species X can have their powers disabled by getting them wet, especially on the hands, so they can easily be disarmed with squirt guns or sprinklers, although just getting a little mud on their hands doesn't seem to affect them.
  • In L's Empire, The SLIPs turn out to be weak to powdered milk, which also doubled as a three year long Brick Joke.
  • Stand Still, Stay Silent: The Plague Zombie monsters that seem to have wiped out most of humanity and their ghost counterparts are weak to sunlight. Some of them also get groggy from the cold. The problem is that the crew's mission makes them go inside buildings a lot and the bad winter weather means that those that are weak to light but not cold have some leeway.
  • Awful Hospital: The Double Doors are a malevolent entity of uncertain motivations that was determined to make Fern eat a sloppy joe made from her own ground-up flesh. It was even capable of overriding commands from the readers with its own intent. The weakness that allows Fern to defeat it? An out-of-order sign, which caused it to explode, ejecting all Hospital patients and staff from the cafeteria.
  • PvP parodied the Wicked Witch of the West melting from water weakness here here.
  • In The Walkyverse, it was revealed that all Abductees have a mental block that leaves them unable to break free from duct tape (A few can apparently resist). Head Alien (the one who created the block) found himself falling victim, even though he was inhabiting someone else's body.

    Web Original 
  • SCP Foundation:
    • SCP-723-D was a nigh-invulnerable man who kept escaping Foundation custody. Finally, two SCP workers took him to a bar, where SCP-723-D died of a peanut allergy from ingesting too many bar nuts. Just to be safe, though, they put SCP-723-D's corpse inside a block of concrete.
    • SCP-2256 was a species of gentle, kilometer-tall sauropod-like creatures that gradually "corroded" any information about themselves, and had a Perception Filter that made them effectively invisible to those not under mnestic effects. Shortly after the Foundation began to study them via mnestics, the SCP-2256 instances started suffering from mysterious illness, stillbirths, and infertility. It turns out that SCP-2256 was hurt by being directly observed, and when a device that fully suppressed their anti-memetic ability allowed the Foundation to take a close-up photo of one, it instantly died. As a result of studying SCP-2256, the Foundation inadvertently brought them to eventual extinction.
  • In the Whateley Universe, The Fair Folk (and mutants who are turning into Fae) are vulnerable to Cold Iron. Wrought iron benches, cast iron skillets, and so on. But Fey is also vulnerable to synthetic fabrics which give her a burning rash. She could be incapacitated by rayon lingerie! (Or The '70s.)
  • Apparently there is a reviewer that can be destroyed by edutainment games.
  • The Centaurians in The Pentagon War are cold-blooded. They automatically hibernate whenever it gets too chilly.
  • Walking City OCT: The Beast, an extremely powerful, assimilating, infectious Eldritch Abomination is vulnerable to Wi-Fi connection, due to also being part-computer virus. As such, the Robot Buddy manages to suck all of The Beast into his system before blowing himself up to take The Beast down with him.
  • JonTron discovers that the Scissorman's weakness is a slice of ham, which causes him to dissolve.
  • Heroes Save the World: Austin Smith can control fire, but apparently it slowly raises his body temperature as he's doing it. You can see how this might pose a problem.
  • AnneBWalsh's Legendbreakers can move freely through time and dimensions, reshape reality with their minds, possess near-total omniscience and precognition, and are effectively immortal. They are also extremely vulnerable to pretzels.
    • Legendbreakers gain their powers by binding themselves to Outer Time through a series of six ritual actions. They must shed blood and tears, drink water and wine, and eat bread and salt. The problem is that the ritual also works in reverse. If a Legendbreaker performs three or more of the six actions in close enough succession while in Inner Time, they become partially bound to Inner Time once more, weakening their powers and making them vulnerable to their enemies. Since pretzels are made of bread and salt, you only need one more of the six to put them in the danger zone.
  • In Dork Souls 3, High Lord Wolnir's weakness is Played for Laughs when Shez shatters his bracelets with a single tap with his sword.
  • Rule 221 of the Evil Overlord List Cellblock B discusses invoking a fake weaksauce weakness, both to hide any real weaknesses and to catch the hero offguard when he tries to use it.
    Whatever my one vulnerability is, I will fake a different one. For example, ordering all mirrors removed from the palace, screaming and flinching whenever someone accidentally holds up a mirror, etc. In the climax when the hero whips out a mirror and thrusts it at my face, my reaction will be "Hmm...I think I need a shave."
  • The Big Bad of episode 200 of Scott The Woz, the Blue Border Watermark that surrounded all his video gains enough power to surround the entire Earth, gloating that it is now eternal life incarnate. Scott then realises he possesses the one power that can counter eternal life: Virginity. Cue Scott beating the border down with his entire Nintendo Wii games collection.
  • Pretending to Be People has The Residue, an amorphous, all-devouring blob that is repelled by water and can be absorbed by fish.

    Web Video 

    Western Animation 
  • The Adventures of Jimmy Neutron, Boy Genius: In "Ultra Sheen", using his encyclopedic knowledge of Ultra Lord, Sheen remembers that his Arch-Enemy RoboFiend has crippling lactose intolerance (despite being a robot). Spraying him with llama milk causes him to explode.
  • One episode of Arthur revealed that Bionic Bunny's weakness is table salt. As soon as it contacts his skin, he loses his powers, retains water, and becomes grouchy.
  • Avatar: The Last Airbender: Element-bending is basically Supernatural Martial Arts combined with Elemental Punch, meaning that you can stop the craziest of superpowered benders by tying up their hands and legs. Though there are those with whom even that won't work (Aang can blow people away with a sneeze, Iroh and Korra can breathe fire, Bumi can earthbend with his face, Yakone and Noatak have demonstrated psychic bloodbending, Combustion Man and P'li can blow things up by thinking at them, and Ming-Hua can waterbend despite having no arms.
  • In Batman Beyond, the assassin Inque is vulnerable to water, which dilutes her form so she can't stay in one piece and has to pull herself back together over time. Despite this, she's likely the strongest villain in the series (in terms of physical power), who has likely come closer to killing Terry than anyone else (even his Arch-Enemy Blight), and while he has defeated her, he has always needed help from someone else to do so.
  • Ben 10:
    • In "The Galactic Enforcers", it turns out that the leader of the Galactic Enforcers (an alien superhero team, said leader an obvious parody of Superman) has a devastating weakness to chocolate, which Ben himself points out is a lame superweakness.
    • In "Camp Fear", a fungus monster is killed using ordinary athletes' foot powder.
  • Ben 10: Ultimate Alien features in the episode "The Big Story" an otherwise-invulnerable plant monster that dissolves on contact with... peanuts. No explanation is given beyond "it's allergic".
  • Birdman from the old Hanna-Barbera cartoons had the powers of flight, energy beams that shot from his hands, enhanced strength, and a personal force field — and drew his powers from the light of the sun. Fair enough, there are plenty of other solar-powered heroes out there (Superman, Cyclops [sometimes], Starfire). Unlike those heroes, however, Birdman apparently had no energy reserve; he became weak as a baby after being removed from sunlight for less than a minute. As it was implied that being out of the sun for an extended period of time ("extended" apparently being something like five minutes) was fatal to Birdman, it's a wonder he didn't spontaneously drop dead at night. No wonder he became a lawyer. After he became a lawyer, he developed a new Weaksauce Weakness; he's completely worthless if he loses the Birdman insignia that he keeps on his forehead.
  • In one episode of The Bots Master, the Big Bad uses a special alloy to make his Mecha-Mooks nigh-invulnerable. The good guys think that they're screwed, until the inventor of the alloy tells them that the alloy can be dissolved by...citric acid. In the end they use lemon juice to defeat the new Mecha-Mooks.
  • Bureau of Alien Detectors: When making an unstoppable zombie army, it's a good idea to ensure that the one thing that will kill them doesn't exist naturally in the atmosphere. Oxygen.
  • Captain Planet and the Planeteers:
    • Being a paragon of clean Earth, Captain Planet is weak against your usual forms of pollution (smog, toxic waste, etc.), as well as Hitler-level hatred, apparently. You might consider these not particularly weaksauce, but it suggests Gaia went seriously wrong in the design stage: the things he was created to fight against are the things that do him the most damage. It's like J'onn J'onnz deciding to be a firefighter or Alan Scott deciding to only fight evil loggers.
    • The Planeteer's individual rings also (occasionally) don't work when there is too much pollution, which again brings up several questions regarding Gaia's design philosophy for the weapons of her pollution fighting champions.
    • His Evil Counterpart Captain Pollution has an even lamer weakness: direct sunlight, lack of pollution, and clean water. Yes, any remotely clean source of drinking water sprayed in his face will make him bow down and crawl helplessly. This seriously deters his ability to establish himself as a credible threat.
  • Namor the Sub-Mariner of Marvel Comics is similarly affected by pollution (though not by hate, which is good, since he seems to run on it), but that makes sense, as he's a water-breather. Because he's a Half-Human Hybrid, he's also subject to insanity and fits of rage if he stays submerged for more than two weeks. Or emerged for more than two weeks. So he needed to switch environment every week to stay sane. Until authors simply forgot the issue.
  • In the CatDog episode "Greasers in the Mist", where CatDog has Lola Caricola infiltrate the Greasers to try and learn about their weaknesses, everyone refers to this trope as "Porkfat", named after the weaksauce weakness of the in-universe movie character, Mean Bob.
  • Codename: Kids Next Door: The Kids overcome Father's pyrokinesis by drenching him in ice cream. (Oddly enough, he still eats it from time to time, especially when he's depressed.)
  • Danny Phantom:
    • Desiree's main weakness is that she has to grant every wish she hears, including wishes like "I wish you were defeated." She even says "I... I must obey!"
    • The Fright Knight is also stupidly vulnerable. If his sword gets sheathed in a pumpkin, he is instantly defeated. His worst nightmare is probably somebody using an ordinary pumpkin as a shield.
  • Darkwing Duck:
    • Not exactly canon, but when he retells his origins in "The Secret Origin of Darkwing Duck," he describes meeting another hero whose weakness is Coo-koo Cola. She winds up falling into a vat of the stuff at a factory and, well... adds to the Disney series' death count. Then again that story's complete baloney (to name but one problem, that hero was played by Gosalyn and Launchpad was her sidekick, neither of whom Darkwing met until after they'd been active for a while), so it only counts for invoked in a Show Within a Show.
    • There's also Comet Guy (Super Weight: 4), whose Achilles' Heel is that every time he hears the sound of a bell, he starts dancing mindlessly until he hears a whistle. His intellect might also count, but frankly it probably can't even do 2+2. Darkwing teaches him to work around the bell problem by via becoming a Dance Battler.
  • The Fairly OddParents:
    • All that fairy magic is neutralized when they are under a butterfly net. There's also all the various "Da Rules" which prevent them from undoing some of the more disastrous wishes, but do nothing to stop them from getting into these situations to begin with. One thinks an "I wish that no wishes that will somehow prevent me from undoing those wishes can be cast" wish might save a lot of trouble.
    • Despite all their bluster of being strong, the Yugopotamians have a huge weakness- anything considered cute, happy, or saccharine. This comes up in several episodes featuring them, where they panic and stop fighting every time they encounter something that falls into that description. In one episode, for example, they challenge Timmy to eat a bar of chocolate, something they consider the most lethal poison in existence, and they pass out in fright when he easily does so.
  • Parodied in an episode of Freakazoid!, where Gutierrez confronts Freakazoid armed with a small collection of famous Weaksauce Weaknesses like a chunk of kryptonite, a gold card and a glass of water. Then he finds out that his weakness is actually graphite bars charged with negative ions. And "poo-gas" (but then again, nobody likes poo-gas.)
  • Spoofed in Futurama where some robots are watching B-grade monster movie where the monster is a human who is "impervious to their most powerful magnetic rays", yet can be brought down by a simple sharpened stick.
    • The Wizard of Oz parody in "Anthology of Interest II" spoofs that movie's witches' melting when they touch water, having both Mom and Leela as witches who predictably end up splashed with a small amount of liquid and melt away.
  • Gargoyles:
    • The titular creatures turn into immobile statues during the day, which leaves them extremely vulnerable. They try to work around this in various ways (working a deal with humans in exchange for protection, magic spells, etc.) However, this is actually a bit of a double-edged sword. Though vulnerable as stone statues, they are COMPLETELY healed of almost ANY wounds (even potentially fatal ones) when they return to flesh and blood. Hudson, being the most experienced of the main cast, uses this to his advantage, defeating the better armed and fitter Demona while protecting an injured Goliath by simply keeping her at bay until dawn. When the sun sets, Goliath is healed and they easily dispatch her together.
    • Oberon's Children, like other portrayals of The Fair Folk, are all vulnerable to iron. Iron can disrupt their magic, actually hurt them, and imprison them. In his not really first appearance, Puck is forced to obey Demona after being bound with iron chains. The Weird Sisters are also coerced into doing a favor in exchange for being released from an iron chain. Later, Trickster God Coyote is trapped in the robot Coyote's latest body which was constructed with iron from a magical cauldron. Their ruler Oberon, while not immune to iron, is powerful enough to withstand being impaled by an iron harpoon though it does cause him to wither in appearance for a short time. (Ringing an iron bell defeated him in his first appearance, but then, this was after he purposely reduced his power.)
  • According to God, the Devil and Bob, Satan can't stand Tony Orlando songs. This comes in handy the one time he actually tries to knock off the comedy routine and physically attack Bob.
  • Mighty Ray of Hero: 108 has the ability to shoot lightning from his eyes. The drawback is that he has to eat a banana to do it...and he hates bananas. He can also have his eyes knocked out of his head, which happens more often than you'd like to think.
  • Zim of Invader Zim is a member of a hyper-advanced, genetically engineered race of aliens for whom Humongous Mechas are a mundane occurrence and whose sole purpose seems to be conquering the entire universe. His main weakness? Water (possibly just polluted water) and meat.
  • Jackie Chan Adventures:
    • In the season 4 premiere, Tohru threw an onion at Tarakudo on the strength of his mother's fairy tales about onions repelling oni. Tarakudo screamed about his eyes burning and vanished. Several episodes in we get Jade digging an onion out of a dumpster.
      Tarakudo: No! Anything but onions! (Jade throws it at him.) My eyes! My eyes! (poof)
    • A one-off villain could be turned to stone if exposed to salt.
  • Jimmy Two-Shoes: According to Word Of God, Lucius actually has some pretty terrifying powers, including Reality Warper abilities. The sole reason he doesn't use them is because his pride would be wounded if he admitted he needed them. Without them, he becomes a rather Harmless Villain.
  • Justice League:
    • The Imperium, White Martian expys in Justice League have an even greater weakness than the usual fire. Direct sunlight causes them to burn and evaporate near instantly. One would think they'd be moving along planet systems away from suns, but no.
    • Alan Scott's weakness to wood was parodied in the Justice League Golden Age Affectionate Parody episode "Legends", with his stand-in version "Green Guardsman", who had a weakness to aluminum. Either way, you've got a superhero who could appear on the news after having been beaten to death with a baseball bat — and considering that one of his foes was the Sportsmaster, who did wield a baseball bat... it's pretty darned weaksauce.
  • Kaeloo: One of Mr. Cat's biggest weaknesses is "zumba with friends"; that is, if his friends turn on zumba music and dance, he starts involuntarily dancing along with them and is forced to stop doing anything else he might be doing at the moment.
  • Kim Possible:
  • The controversial Looney Tunes short "Injun Trouble" (and its 1945 color remake "Wagon Heels") features Injun Joe, The Superchief as its villain. Injun Joe is a powerhouse; he shatters mountains and laughs at gunfire. But Porky Pig's sidekick Sloppy Moe knows Injun Joe's secret weakness: he's ticklish!
  • Lucy, the Daughter of the Devil:
    • Not only is vampires' weakness to sunlight so great that they can be turned to dust by UV fluorescent lights, but they're deathly afraid of balloons.
    • And when Senator Whitehead turns into a giant monster, his weakness is beatboxing.
  • An episode of Martin Mystery had an alien fungus monster that had taken over a small town and replaced the inhabitants with clones. Both it and the clones could be killed with salt. As luck would have it, the small town just happened to be in northern Utah.
  • The second act of the Mr. Bogus episode "Totally Bogus Video" showed that the Dirt Dudes are vulnerable to fruit punch, as it causes them to melt when it comes in contact with them, a la the Wicked Witch of the West.
  • My Life as a Teenage Robot:
    • "This Time With Feeling" has an incredibly powerful, sadistic, and sexist supervillain, Himcules, who gets stronger and stronger anytime he hurts or humiliates someone. And of course, he appears right after Jenny has implanted sensors in herself that either tickles herself or causes her pain. Stuck in "Pain" mode, Himcules continues to gain more and more muscle (and even pleasure) every second he makes her cry in pain... then she comes upon a little girl who kindly (sorta) switches her "Pain" switch to "Tickle", and it just so happens that laughing at Himcules is his only weakness.
    • Another example would probably be Jenny herself. She’s a powerful crime-fighting robot who’s only weakness is ...water.
  • In what might be one of the most literal examples of this trope, The New Scooby-Doo and Scrappy-Doo Show episode "Scooby's Gold Medal Gambit" featured a villain known as Chameleon who was a Master of Disguise, capable of disguising himself so flawlessly as to be completely unrecognizable. His one flaw? He hated Worcestershire sauce. So much that whenever someone so much as mentioned the condiment, he felt compelled to break character to scream about how much he hated Worcestershire sauce.
  • In the Planet Sheen episode "To Chill a Mocking Blurg", the Blurgs explode after being complimented.
  • The Powerpuff Girls:
    • When Buttercup wanted to become a better superhero in "Super Zeroes", she became Mange, a knockoff of Darker and Edgier comic book Anti HeroesSpawn in particular. However, when the time came for her and her sisters (both of whom also assumed their own "better superhero" identities) to go out and fight a monster destroying Townsville, Mange was the only one who stayed behind, saying it's too bright and that she only travels at night. Mange then spent the rest of the day sitting on the couch with Professor Utonium until night fell, arriving too late at the scene as the monster had already left (her sisters were also late for reasons of their own). The three girls spent the night under a tree. When the monster came back to face the girls again, Mange sits out the fight, preferring to stay under the tree's shade. This attitude led the monster to eventually call her "Little Miss Darkness who’s afraid of a little sun".
    • Being kindergarteners, the girls have plenty of weaknesses of their own any other time—they have been shown to be deathly afraid of "cooties", cockroaches, and broccoli. The episodes these weaknesses show up in usually involve some sort of super-powered or evil version of it, so it's not always so silly...
    • There's Antidote X which was used in only one television episode ("Slumbering With The Enemy", on the girls themselves) and in the movie (on Mojo Jojo). Mojo also tried to use it in another episode where he also used Chemical X to give his then-partner Princess super-powers. Unfortunately, this backfired on both villains, and Princess was hit with the Antidote X, letting the Girl trounce them both.
    • The original incarnation of their Spear Counterpart enemies the Rowdyruff Boys are so grossed out by the girls' kisses that they explode. And after being genetically modified to actually gain strength from this past weakness ( aka puberty), they gain a new weakness, humiliation. Yes, humiliation. Anytime they are embarrassed and laughed at, or "whenever their masculinity is threatened", they shrink.
  • The Sheep in the Big City episode "Fleeced to Meet You" had a sketch where the superhero Completely Powerful Guy is informed by his sidekick Wonderful Boy that there are various criminals on the loose that he's expected to stop. Completely Powerful Guy claims that the villains' various attacks, such as using dynamite, pollen, or even tickling, are his most dangerous vulnerabilities, though it's implied that he's just making up excuses to avoid going after the crooks. Wonderful Boy rightly calls Completely Powerful Guy out on avoiding going after the criminals with the flimsy excuse that they could easily hurt him.
  • SpongeBob SquarePants:
    • The alien jellyfish in the episode "Planet of the Jellyfish" dissolve into puddles of goop upon contact with mayonnaise.
    • One of Mermaid Man and Barnacle Boy's antagonists is the Dirty Bubble, who is... a bubble. Go ahead, guess a weakness.
  • If SheZow gets her hair messed up, she loses her power — fortunately for her, she has a can of hair spray in the Beautility Belt to fix this.
  • Superman: The Animated Series: Mr. Mxyzptlk is so powerful that he has no natural weaknesses. To make his fights with Superman more challenging, he gives himself one. Which one does he choose? Saying his own name backwards. Used hilariously in "Mxyzpixilated" with Superman using clever and creative ways of exploiting Mr. Mxyzptlk's "weakness", often without having to use any sort of super powers at all. In one, Clark tells Mxyzptlk he can't "play" until he finishes proof-reading a paper. Mxyzptlk grabs it and uses magic to cross out all the typos. Three guesses what they spell.
  • The members of the Sushi Pack are rendered powerless by any kind of heat, but even worse, they feel compelled to announce this every time a villain pulls out a heat lamp.
  • In the Talespin episode, "Pizza Pie in the Sky", the normally healthy and active Louie is severely allergic to anchovies. One whiff of the irregular anchovies that Baloo and Kit bring him is enough to make him ill and delusional.
  • In Teenage Mutant Ninja Turtles: Fast Forward Sh'Okanabo's first attempt to infect Earth with his progeny is thwarted by...sunlight. Although this is handwaved as a particular, unexpected feature of Earth's, and Sh'Okanabo himself is not normally affected, dealing with his weakness is the thrust of his character arc throughout the remainder of the season.
  • ThunderCats (1985):
    • Mumm-Ra had a weakness to his own reflection. The writers eventually realized this made Mumm-Ra too lame, so they had him get over it. The Thundercats had a harder time dealing with him after that. Even more so when he got an Infinity +1 Sword of his own.
    • Plutar was weakened by soap. The show was so far in the future that modern society was all but forgotten; soap was treated as an ancient science.
  • In The Transformers, the Decepticons were once driven off by a fire suppression system that sprayed them with fire-retardant foam after Megatron claimed it would short out their circuits. Why this doesn't make Inferno and Hot Spot (Autobots who turn into fire trucks) into the Decepticons' primary nemeses has never been explored. In what may be a weird mixture of Call-Back and Running Gag, Sideways in Transformers: Cybertron and Starscream and Blackarachnia in Transformers: Animated have also been incapacitated by fire-retardant foam for varying lengths of time. This includes the foam from a traditional human-sized fire extinguisher, in the case of Sideways.
  • In Wander over Yonder the extremely powerful Lord Dominator has only two weaknesses; being cut off from the armor that provides her powers (understandable and not often a problem) and, far more embarrassingly, a severe allergy to pollen. In the second-to-last episode of season 2 this leads to her humiliatingly defeating herself by picking up a flower.
  • WordGirl isn't so much defeated by a cute little kitten, but rather easily distracted by one. She also compensates for her language abilities by showing a complete lack of competence in art, poetry, and dance.
  • Yin Yang Yo!:
    • The only thing that prevents Brother Herman from taking over the world is the fact the he's allergic to panda fur. As long as Master Yo, the last panda on the planet, is around, failure will be his only option.
    • His brother Carl, The Evil Cockroach Wizard has been shown to be a very powerful villain capable of global domination himself, but he has one glaring weakness: self-esteem. He's been defeated by insults and peer pressure, and his own low opinion of himself keeps him from going full-tilt against the heroes and his brother.
  • Zeroman's weakness is anti-static sheets, which mess with Zeroman's suit's systems.

  • The MLB has starting pitcher Jon Lester. He's a three-time World Series winner, four-time All-Star, and a perennial Cy Young candidate. Only he has some trouble throwing to first base. Other players have had this problem at some point in their careers, such as pitchers Matt Young and Matt Garza, and second basemen Steve Sax and Chuck Knoblauch; catcher Mackey Sasser uniquely developed trouble throwing the ball back to the pitcher accurately. The term used for this in baseball is "The Yips."
  • Also in baseball, we have knuckleball pitchers. Knuckleballs take relatively little force to throw and put little stress on a pitcher's joints. So, once mastered, knuckleball pitchers are virtually guaranteed long careers. The catch? The pitch is almost totally dependent on the pitcher's fingernails for control. So a broken nail or hangnail a standard pitcher might not even notice (or could handle with a simple bandage) can wreck a knuckleballer.

    Real Life - Humans and Other Creatures 

  • Silver is deadly poisonous to most microorganisms. As for why they don't make surgical instruments out of silver: it's too soft and doesn't keep its edge.
  • Copper is also antiseptic, which is why in older hospitals, door handles and other high-touch surfaces were made of copper or bronze. The problem is that copper can turn black, then green as it tarnishes, and both copper and bronze can stain skin when they tarnish.
  • Despite being touted as the Ultimate Life Form, Cockroaches have a few. Their biggest one is temperature, many species will outright die if they aren't kept within a narrow range of temperatures. The ones that don't die usually can't reproduce in mild hot or cold conditions. The reason they've become such an infamous pest is that temperatures they tolerate happen to be the same range that humans prefer.
  • Crocodiles. Easily one of nature's deadliest predators, incredibly hardy and adaptable, can heal from torn off limbs and have remained virtually unchanged since the age of the dinosaurs since their design was perfectly adaptable to weather through several mass extinctions. But a croc's biggest, most pathetic weakness? While their jaw-closing muscles are incredibly strong and capable of ripping a zebra's leg clean off...their jaw-opening muscles are surprisingly weak, able to be held shut by a thick rubber band, a roll of tape, or even by human hands. It's almost as if evolution found out crocodiles were too overpowered and decided to give them at least one weakness.
  • Elephants Are Scared of Mice. At least in cartoons. The scientific jury is still undecided whether this has a sound real-life basis or whether it is just an Urban Legend. Mythbusters tested it and found it confirmed: elephants will actively avoid mice if at all possible. Though it's not specifically mice so much as it is wariness at something smaller than an elephant's poor eyesight can reliably identify, to them it could be a snake or something else potentially threatening-the Mythbusters test was done by suddenly revealing white domestic mice to wild elephants, who would have only ever experienced a sudden flash of white color low to the ground as the warning signal of a disturbed cobra. They could also simply be aware of their surroundings and give the small quick moving creature a wide berth to avoid stepping on it.
  • Giraffes can easily suffer fatal neck and head injuries just from falling over. Don't believe it? Just imagine the whiplash with a neck that long... This is true of most large animals—the bigger you are, the worse falling over is for you. That's why, for example, elephants keep at least 3 legs on the ground when running (rearing up on their hind legs, as is sometimes seen in circuses, is not a natural behavior). Gravity is a bitch.
  • Every human is at risk of commotio cordis (agitation of the heart). This requires being hit in the chest over the heart at the right point of a heartbeat. Only a few dozen cases are reported per year, but victims are almost guaranteed to die if it happens (survival rate is 35% ... if the victim is treated in three minutes). Even a gentle blow that doesn't bruise the skin can trigger commotio cordis—which means every time you get hit in the chest, you're playing Russian Roulette. Even worse, it's most common in teenage boys, usually while playing sports... Also, some martial arts like Taekwondo explicitly trains the fighter to go straight for that part of the body to ensure a swift and instant death to the opponent. For a relatively medium sized mammal, humans also have several very easy to hit weakspots that are very exposed due to us standing upright and showing our underbelly when facing something. The wrists, groin, inner thigh, and neck can all bruise very easily due to the high number of nerves and blood vessels under thin skin with no sturdy skull or ribcage to protect them like the heart or brain. An infection or cut in such places can be deadly in minutes even if it's only half an inch deep.
  • Allergies, especially if the allergen is relatively common. Nuts, animals, shellfish, the case of peanut allergies, some cases are so severe that people could be in serious danger just by being in the same room as peanuts. Some people suffer from Aquagenic Urticaria (water allergy). That's right, there's people who were unfortunate enough to be born allergic to a substance they can't live without. It's technically not an allergy, but that doesn't make it any better. Any moisture build up on their skin aggravates the condition, so they must carry umbrellas with them at all times, avoid heavy clothing/exercise to prevent sweating and prefer to remain indoors in well ventilated surroundings. For all their precautions, though, they still have to wash themselves with water regularly.
  • There's a lot of stuff that can incapacitate a human. Tickling is a lot of peoples' weaknesses and a lot of people have a sound that 'goes through them' like the sound of plastic folders being rubbed or nails on a blackboard.
    • Humans with various mental illnesses/neuro-developmental disorders, such as an emotional disorder or autism spectrum disorder, have severe sensitivity to loud noises and the above types of noises, to the point of experiencing anxiety and physical pain when hearing them.
  • The right pattern of flashing lights can cause nausea in any human, people with epilepsy simply have a more severe reaction. This has since been weaponized And now you can build your own.
  • Some people with PTSD have triggers of the Nightmare Retardant variety that, out of context, seem laughable to those who aren't triggered by them, but remind them in some way of their traumatic experience and can trigger anything from an uncomfortable sensation to a full-blown flashback of the event. To make things worse, people with this kind of trigger will sometimes experience belittlement if they dare to disclose it. Worse is the way Kryptonite Is Everywhere; people could understand if a loud bang causes someone who'd been in a war zone to flash back to a bomb strike, but what if a certain enemy vehicle sounded a lot like a certain civilian one, or someone was holding a cup of McDonald's coffee just before the worst attack they'd lived through? Suddenly a car in need of a tune-up or a cup of coffee on a table is Kryptonite to a Colonel Badass who eats nails for breakfast. One could also easily imagine a person who has suffered abuse needing to, say, not watch Law & Order: Special Victims Unit if they'd been molested. But some could watch it all day, and then the mailman comes by wearing the same brand and color of shoes their abuser preferred.
  • Diabetics have sugar. Too much AND too little.
  • Albinos have sunlight. A couple of other disorders too, including xeroderma pigmentosum (decreased ability to repair damage to skin from UV light).
  • Phobias in general can be like this for those who suffer from them; they cause crippling, irrational panic at the slightest indication of the feared objects. Worse, being irrational after all, the object doesn't even have to be objectively frightening. Most of us can probably understand why people would be afraid of spiders, or snakes, or heights, but imagine having a phobia of flowers, buttons, or peanut butter? (Imagine it too hard and you'll get phobophobia...)
  • For a species that's bipedal, humans are actually not that great at doing it for long periods of time. Many people getting spinal and foot problems later in life, and people can pass out by locking their knees for too long. This isn't normally a problem, but people who have to stand still for long periods of time, such as people in the army, marching band, or choir, have to make sure to bend their knees occasionally.
  • The skins of land snails and slugs are water permeable, and as such, are extremely vulnerable to fatally drying out. It's also why they're limited to dark, moist environments. Salt kills land snails and slugs by screwing up their osmotic balance, in that the salt speeds up the drying process by pulling the water inside of their cells and internal organs out.

    Real Life - Objects 

  • Most electronic devices can be damaged irreparably by contact with water. This happens because waternote  is a great conductor of electricity and causes it to run places it's not supposed to. Contrary to popular belief though it's not always fatal; if the device is off and you dry it, it could be salvaged. In fact, the best way to clean your keyboard if it can take the abuse? Run it through the dishwasher.
  • Modern electronics are often powered by Lithium-Ion batteries because of their high charge speed, stable voltage and limited charge decay. Problem is that lithium catches fire in contact with water. A damaged battery must be discarded immediately. This is applicable for electric cars as well - battery fire has destroyed a fair deal of vehicles that way.
  • Early stealth aircraft can very easily lose their stealthiness to the most mundane of things.
    • The B-2 Spirit is one of the most advanced stealth bombers in the world. Yet the radar-absorbent coating can be easily damaged by weather effects like rain, which is why they're housed in climate-controlled hangers.
    • The F-117 Nighthawk, the world's first stealth fighter, had a radar-absorbent coating that would be ruined by just leaving fingerprints.
    • More modern stealth aircraft have much more durable coatings, with the F-22's topcoat continually being updated, and the F-35's coating, called FiberMat, actively baked into the skin structure.
  • The RIAA (Recording Industry Association of America) came up with a brilliant new method for encrypting data on CDs, which works fine on PC computers, but not on Macintoshes. It can be negated by drawing a circle on the CD with permanent marker.
    • Optical discs themselves (especially those which have two shiny sides) have a Weaksauce Weakness - simple tape. If one pastes tape or a label on the front of some discs, then decides to remove the tape or label, the adhesive peels off the data-containing foil layer, rendering the disc unusable. This is because the disc has almost nothing between the foil and the label side of the disc. The fact that the disc is shiny on the label side as well as the data side shows that the disc has no protective label printed onto it, only a thin layer of plastic that is easily removed. In fact, any optical disc is much more likely to be ruined from the label side than the data side because of the thinness of that side, even with a factory-printed label.
  • Laser weapons that are starting to be used by the US military can be thwarted by such phenomena as dust, sand, bad weather, clouds, smoke, steam, etc. As Stephen Colbert put it, "it's a good thing they're not planning on using it in regions that have above-mentioned problems, or if Iran develops sand technology".
  • Tin foil, silverware, or any conductive material can easily destroy a microwave oven in seconds. This happens because the microwaves generated by by the magnetron cause the electrons on the surface of the metal to, in Layman's Terms, "slosh around". This causes sparks and electrical arcs, which are insanely hot, and can easily destroy dishes and the plastic interior of the microwave.
  • The Ferdinand (Elefant) tank destroyer — which was based on the chassis of rejected Porsche-designed Tiger I tanks — was quite impressive on paper with extraordinarily thick frontal armour and a powerful gun capable of punching through any Allied tank fielded during the war. However, because of Ferdinand Porsche's penchant for toying with experimental technology it used a novel petro-electric drive for its transmission, which allowed for more precise steering and high-speed reversing, but was prone to overheating and catching on fire. Compounding the problem was that Elefant was horribly overweight, weighing more than the already overburdened Porsche-designed Tiger I, which itself was heavier than the rather husky Henschel-designed Tiger I. As a result, the Elefant can catch on fire when climbing hills. That's right, a slight incline can start a fire in a tank destroyer.
  • Digital terrestrial television offers clear pictures without the expense of cable or satellite service—as long as you're within range of the broadcasting tower with a properly adjusted antenna. An improperly oriented antenna or weak signal will cause a TV picture to break up like a scratched DVD, where in the analog days you would have a snowy picture but still be able to make out the scene. This is known as the "digital cliff effect". This can be especially annoying for people in countries that have discontinued analog terrestrial TV broadcasting.
  • Programming/coding. Just one missing or extra symbol is enough to make your program fail. Either it will fail at compile time, in which case most compilers will at least helpfully (or not) point out the mistake...or it compiles, only for it to execute in ways you did not intend, and you look through hundreds, maybe thousands, of lines of code to see what you did wrong, and then plant your palm on your forehead because you had an extra semicolon at line 500.
  • The Russian screw tank was a wildly innovative vehicle able to cross snow, ice, mud, gravel, debris, water, in short any terrain you can imagine. Except a good road.


Video Example(s):

Alternative Title(s): Epic Frail


Ying's Sneezes

Ying's Weaksauce Weakness - sneezing. She loses her Super Speed when she sneezes, but sneezing again reenables her power.

How well does it match the trope?

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Example of:

Main / WeaksauceWeakness

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