->''"An eye for an eye makes the whole world blind."''\\
--'''MahatmaGandhi'''

This trope, which happens a lot in the less idealistic revenge stories (as revenge stories can get idealistic anyway), posits the idea that the moral maxim "[[TheGoldenRule do unto others as you want others to do unto you]]", one of the most famous justifications for vengeance and punishment, is not perfect. It ceases to be Newtonian EquivalentExchange "justice", and can mutate into Entropy; because of the complex web of genetic and social bonds that one forms over a lifetime, as well as the interactions between everyone entangled in that web, revenge might well begin with you but it most likely will not end with you. Yes, he deserved to be treated like how he treated you, but don't you think that if others saw you, they may end up seeing that ''you'' deserve to be treated like you treated him too? And, even so, no one should have to suffer at all, even if they deserve to.

[[GreyAndGrayMorality No side is completely wrong, no one is really right]], both are very understandable, and such stories are usually painful to watch. MoralMyopia often deepens it, when both sides think that [[DisproportionateRetribution treating one of theirs is worth treating a dozen of the others]], and so attempt to inflict that many torments and deaths in retribution. The escalating body count creates a vicious circle that spreads out like a virus causing more and more casualties as it goes on, until it ends with [[DownerEnding one party]] ([[KillEmAll if not both of them]]) [[FinalSolution getting wiped out entirely]] or being stopped.

The Cycle of Revenge is one way to show that "two wrongs make a right" is a logically fallacious claim, and also {{deconstruct|ion}}s TheGoldenRule, or at least how everybody uses it as justification for punishment. It, more often than not, results in ATragedyOfImpulsiveness.

It's also very common in gangster stories, with the average gangster character avenging the death of a friend upon a rival gangster who may very well have had a similar motivation for his killing, as well as Romeo and Juliet style FeudingFamilies stories. [[EscalatingWar A lesser form of this]] tends to occur when two characters have a prank competition.

Very unfortunate TruthInTelevision, and OlderThanFeudalism; the LensmanArmsRace and SerialEscalation of vengeance upon vengeance makes up much of the history of the human race, with examples like the infamous assassination of Archduke Franz Ferdinand which triggered UsefulNotes/WorldWarOne which then fueled Germany's RoaringRampageOfRevenge in UsefulNotes/WorldWarTwo, and blood feuds elsewhere that are still going on to this very day, with no one remembering just what started it, but motivated by all the violence that followed, with each successive revenge motivating the victims or others connected to them to strike back at the one who took the initial revenge.

A note on the "eye for an eye" maxim: many ethnologists believe that this wasn't a demand to go out and seek revenge, but rather a ''ban'' on inflicting DisproportionateRetribution (so if someone blinds you in one eye, you can only half-blind them back, and cannot justify torture or murder). According to this theory, those who laid down this rule believed that this limitation would ensure satisfaction of the Golden Rule for everyone and put a brake on the entropy of such vicious cycles.

According to another theory, espoused by Jewish rabbis, the Hebrew actually implies that monetary compensation can be given in place of the eye, with the amount of the compensation to be the same regardless of whose eye was harmed (hence, "eye for an eye"). Unfortunately, given human nature in general, people didn't much listen (especially when "monetary compensation" simply led to unjust instances of ScrewTheRulesIHaveMoney), and as a result -- as Mahatma Gandhi, a well-known nonviolence activist, is supposed to have put it -- "An eye for an eye makes the whole world blind."

Kind of makes you wish someone, in an attempt to counter this cancerous mutation of the Golden Rule, learned to TurnTheOtherCheek or ask for (and give) {{Forgiveness}} or at least just deliver a RestrainedRevenge. [[WideEyedIdealist But it rarely works]], as chances are [[NoGoodDeedGoesUnpunished you'll be punished anyway]]. Or you could just ''[[KillEmAll exterminate]]'' the opposing party until there's no one left to want revenge on you. But [[GenocideBackfire it rarely works]], because [[NiceJobBreakingItHerod there's always a survivor]]. Or as Theatre/RomeoAndJuliet proposed, we can try ThePowerOfLove. But [[LoveHurts this rarely works either]], [[NoEnding so...]]

See BestServedCold, FeudingFamilies, HeWhoFightsMonsters, RememberTheAlamo, RevengeMyopia, RoaringRampageOfRevenge, ThenLetMeBeEvil, and YouKilledMyFather. [[http://en.wikipedia.org/wiki/Reciprocal_altruism Reciprocal altruism]] (and, indeed, friendship in general) is quite possibly the flip side of this coin.
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!!Examples:

[[foldercontrol]]

[[folder: {{Anime}} and {{Manga}}]]
* One of the assassination jobs in ''Anime/{{Noir}}'' was because of reasons like this. The girls were hired to kill a man who had run a concentration camp responsible for the slaughter of an ethnic group in Eastern Europe. The survivors and their descendants hired Noir to kill him in revenge. As the episode unfolded, they find out that the man had not only [[TheAtoner become the kind and benevolent benefactor of a poor community]], his own people had been slaughtered by the aforementioned ethnic group as part of an ongoing blood feud when he was a child.
* In ''Manga/ElfenLied'', you can understand both sides. But they are also both wrong. At the point of the manga, it has become "kill or be killed" for both sides. For instance, Lucy is driven to her acts through cruel and depraved treatment, but after killing the horrible people, she kills innocents as well, and infects others who survive their encounters with her. Infectees ended up with their children being born silpelits, and in turn, the silpelits kill their families as well, so they sign up to suppress the diclonius virus, causing many inhuman experiments. The experiments break out and kill the scientists and several innocents so the military puts them down. Kurama was infected by a silpelit, and loses his wife in child-birth, he [[spoiler: seemingly]] kills Lucy's only friend, and captures her, so she maims his adopted daughter and kills his biological one. He accidentally shoots Kouta, and she rips his arm off.
* In ''Manga/FullmetalAlchemist'', Lust sums up the trope rather poetically:
--> Bloodshed begets bloodshed. Hatred begets hatred. The rage and emotion sinks into the land and stains it with the crest of blood. No matter how many times they repeat themselves, they never learn. These sad fools...
** It is also averted with [[spoiler:Winry deciding to spare Scar, who killed her parents. Since Scar is all about the vengeance - and expanding, not shrinking, its scope - he is mystified and possibly mellowed by Winry's kindness in the face of the wrongs he did to her]].
* In ''Manga/{{Naruto}}'', revenge is one of the main themes. The one who is biggest on revenge is Uchiha Sasuke, who is trying to avenge his family, who were killed by his brother Itachi, going to all possible extents to reach this goal. [[spoiler:Until he discovers that Itachi was forced to do this to save Konoha, because his family tried to get revenge on the others in the village for being treated as outsiders and for them casting out their leader. Who, by the way, also wants revenge for his clan not supporting him and assists in their murder. And then Sasuke wants to get revenge on Konoha...]] Just as Kakashi told him once: revenge just leads to new revenge.
** The entire Uchiha versus Senju issue actually appears to have a consistent pattern to it with the big names. It began when [[spoiler:the eldest son of the Sage refused to accept his younger brother being heir, splintering their family permanently]]. It repeated again when [[spoiler:Madara refused to accept Hashirama as the First Hokage, cementing the rift between the Uchiha and Konoha, as a Senju was its first leader. And now it is repeating with Sasuke refusing to accept Naruto could grow so much stronger than him, driving him to Orochimaru and Madara]]. One of the reasons the conflict keeps reappearing is because [[spoiler:the Sage's sons are being reincarnated, continuing their sibling rivalry right where they left it.]]
** This is Pain's entire theme -- trying to create a weapon so strong it'll stagnate the cycle due to fear. He uses it for many a NotSoDifferent speech as well. [[spoiler:Naruto ultimately decides to break the cycle of revenge between Pain and Konoha by sparing him. [[RedemptionEqualsDeath This pays off]] [[DeathIsCheap tremendously]].]]
** Sasuke himself came close to potentially starting one between [[spoiler:his team and some members of the Cloud village]] by [[spoiler:apparently killing Killer Bee]], with the fact that [[spoiler:he actually ''failed'' to capture him]] making revenge extra-pointless. Naruto, [[GenreSavvy seeing where this would end up]], decides he needs to do whatever he can to stop this.
** In an interesting twist, Shikamaru cites this as his reason for [[spoiler:wanting Konoha to kill Sasuke. So that Sakura and Ino won't go out to avenge him if the Cloud ninja kill him, which would result in them being killed and avenged by their loved ones, creating a vicious cycle that would lead to war]].
* Revenge is often used in the ''Franchise/{{Gundam}}'' franchise. Especially various {{Char Clone}}s (tm) are often motivated by it. Char himself and [[Anime/MobileSuitGundamWing Zechs Marquise]] try to avenge the murder of their families, therefore infiltrating the responsible military organization. [[Anime/MobileSuitGundam00 Lockon Stratos]] goes to all possible extremes to avenge the murder of his family. [[Anime/MobileSuitGundamAGE Flit Asuno]] even goes to the point of becoming a DarkMessiah because of his desire to avenge his parents [[spoiler:as well as [[LoveInterest Yurin]] [[LoveHurts L'Ciel.]]]]
** This is given the most emphasis in ''Anime/MobileSuitGundamSEED'', after the Atlantic Federation (secretly ruled by Blue Cosmos) destroyed a colony of PLANT, ZAFT quickly invaded wanting revenge, [[spoiler:with the brunt of this by Patrick Zala whose wife was killed during the attack. After Blue Cosmos gains control of the entire Earth Federation, and Patrick Zala gains control of PLANT the war becomes one of genocide as both forces seek to completely annihilate the others. Patrick Zala having been driven insane by the death of his wife is finally killed before he can kill the Naturals.]]
*** ''Anime/MobileSuitGundamSEEDDestiny'' continues the Blood Feuds, with [[spoiler:Radical Coordinators who were followers of Patrick Zala dropping the remnants of the colony on the Earth as they believed that the Earth peoples' (naturals) haven't suffered enough in the war, believing that they deserve to die for Junius Seven. The people who dropped that colony seem to have lost family and friends in that attack. The violence feeds into each other, and the Earth peoples reignite their hatred at the Coordinators and declare a second war against ZAFT.]]
** Cagalli sums it up quite nicely.
---> '''Cagalli Yula Athha''': "One guy's killed for killing another and then he's killed for killing him. How is that kind of twisted thinking ever gonna bring us peace? Well?"
** In ''Anime/ZetaGundam'', this trope is manifested in Kamille and Jerid's series-long rivalry. Throughout the series, there's a back and forth of Kamille and Jerid killing the people that the other cares about, deepening their rivalry to pure hatred. It gets to the point where it seems like the only thing Jerid cares about is killing Kamille.
* This is the purpose of [[spoiler: Zero Requiem]] in CodeGeass. Unlike many of the examples in this list, [[spoiler: the idea is that if Lelouch is hated by everyone, then dies with no one to avenge him, then the cycle will end. This has not really gone well with a large portion of the fanbase, as there are far too many things that Lelouch was never responsible for, and fails to exonerate Britannia in the eyes of it's many victims, nor does it really provide a solution to Britannia's massive racism problems.]]
* A continuing theme in ''Main/GunslingerGirl''. Both Agency handlers and terrorists are obsessed with avenging family members killed by the other side. Those who aren't are invariably either corrupt leaders or disillusioned veterans.
* Used in the otherwise nonsensical filler-filled third season of LightNovel/ZeroNoTsukaima. The audience expected that TheAtoner [[spoiler: Colbert]] had died due to injuries in season two, but some AssPull revived him. This gives [[spoiler:Agnes]] a good reason to kill him. But then she gave a reason not to: if she killed him in revenge and cold blood, his students would avenge him, perpetuating the cycle of hatred and revenge. It is hinted that she will still kill him, but presumably in a fair, no-hard-feelings kind of duel to the death.
* ''Anime/AfroSamurai'' has this as the main theme of the series. Sure, you can get the title of being the number one fighter, but you have to take lives to do so. Which won't sit well with the surviving kin/friends of the deceased, as Afro roughly finds out.
** At the end of ''Resurrection'', [[spoiler:Afro has come to accept this. On reclaiming the Number One headband, he goes to a child whose adoptive father Afro killed in front of him - the same way Afro's father was killed in front of ''him'' - and hands him the Number Two headband, with a quiet, "Any time you're ready".]]
* The major plot line in the 2nd season of ''Anime/HellGirl''.
* One of the key themes of the ''VinlandSaga''.
* This happens with Yoh and Ludsev in ''ShamanKing''.
** As well as Ren, Iron Maiden Jeanne, Lyserg and the rest of the X-Laws, and a number of others. The ArcWords in the Kyoto Island arc are "When you hurt people, they hurt you back."
* A central premise in Studio Gonzo's ''RomeoXJuliet'', where it's strongly implied that the love between the eponymous protagonists is the only thing that can prevent the cycle of violence from continuing (and that the fact that one started in the first place may very well cause TheEndOfTheWorldAsWeKnowIt).
* ''Franchise/WhenTheyCry'', in [[VisualNovel/HigurashiNoNakuKoroNi both]] its [[VisualNovel/UminekoNoNakuKoroNi incarnations]], ''lives'' off this trope. In Higurashi, it's helped along considerably by [[spoiler:Hinamizawa Syndrome]], while in Umineko, the Ushiromiyas are a [[BigScrewedUpFamily one-family family feud]].
* A horribly convoluted one in ''MasterOfMartialHearts''. [[spoiler: a generation ago Aya's father organized a StreetFighter expy brawl for plucky [[ActionGirl Action Girls]]. Aya's mother won, the other contestants were mindraped to the breaking point, conditioned into sexual slavery and sold. Two sisters in particular took the short stick: the younger got raped and killed by Aya's father, in front of her young daughter, Miko, the eldest got her voice box removed and was sold overseas. She managed to escape, rebuilt her life as a somewhat functional StepfordSmiler CuteMute and had a daughter, Natsume. When the two cousins managed to know all the story, they decided to exact revenge. By masterminding and creating a new Platonic Hearts Tournament. And enrolling Aya. And making her fight, and defeat, countless otherwise innocent Action Girls. [[MisplacedRetribution Who are then promptly mindraped and maimed as their mothers were.]] [[DisproportionateRetribution And trying, failing, to get Aya to suffer the same fate]].]]. Casting aside the sheer idiocy of the whole plan, there's no warranty whatsoever that the cycle can't be restarted at any time, now, [[spoiler:something Aya is willing to change at the end of the series even if it means having to murder Natsume and Miko's families so they don't start any more trouble.]]
* Averted in ''Manga/OnePiece''. It began when Usopp was beaten up by the Franky Family as they stole the crew's money. Cue [[PapaWolf the Straw Hats retaliating]] by destroying the Franky Family's home with everyone in it. When Franky finds out his nakama were beaten up and their home in pieces, he says ThisIsUnforgivable and hunts Luffy down to get even. However, a series of circumstances would have the Straw Hats and the Franky Family work together and in the end, Franky pulled a HeelFaceTurn and ended up joining the Straw Hats.
** The Fishmen Island arc is all about this, bringing together several subplots that have been running since the beginning of the series. Queen Otohime is the most open-minded of the fishmen/mermaids and advocating for peaceful reconciliation rather than continued retaliation against humans, which [[spoiler: she would hold even to her death and pass on to her children.]]
** Arlong, while initially not as willing to kill and subjugate humans as seen in his flashbacks, let his continued hatred and prejudice (as well as [[spoiler:his captain Fisher Tiger]]'s death by humans) convince him that all humans are nothing but trash. His actions encouraged Hody Jones, who had grown up in a culture dominated by hate and racism towards humans and sees anyone associating with humans as his enemy, attacking and killing fishmen/mermaids. [[spoiler: Hody Jones was the one who killed Queen Otohime and has even stated that humans have done nothing to him personally.]]
* Averted in ''CodeBreaker'': [[spoiler: Kouji allowed Toki to believe he was the one who killed Nenene so that Toki wouldn't kill the real murderer Saechika, causing the Prince to kill Toki to avenge her long-lost brother. "I killed your sister and your brother is dead. Things are neater that way."]]
* Sheila of ''Manga/{{Superior}}'' explains this trope to Exa while standing in [[DoomedHometown the ruins of his hometown]]. So long as humans kill demons, demons will kill humans, so she wants to kill every human to end the fighting forever. (Exa, for his part, has vowed to [[TechnicalPacifist never kill anyone other than Sheila]] so as to prevent further retaliation.)
* Basically the whole plot of ''Manga/{{Basilisk}}''.
* Averted in ''Anime/HeartcatchPrettyCure''. After Dune kills [[spoiler:Yuri's father]], Yuri's on the verge of tearing him apart. However, Tsubomi, who witnessed the action as well, stops her and begs her not to go through with it. It works and the later-united team is able to put Dune down properly.
[[/folder]]

[[folder: Comic Books ]]
* In the original ''[[Comicbook/TeenageMutantNinjaTurtlesMirage Teenage Mutant Ninja Turtles]]'' comic books, the turtles kill Oroku Saki/The Shredder on Splinter's behalf, as revenge for the death of Splinter's former owner, Hamato Yoshi, who had died at Saki's hand. Yoshi, for his part, had been killed (along with his lover Tang Shen because Saki was a dick) as revenge for slaying Oroku Nagi, Saki's older brother. Why was Nagi killed? Because when Tang Shen, the object of both Yoshi and Nagi's affections, chose Yoshi over Nagi, Nagi flew into a rage and [[NoHoldsBarredBeatdown savagely beat her]]; one berserker rage later, Yoshi had killed Nagi. Saki's death wasn't the end of things, however; after he was slain, the Foot Clan that he led became honor-bound to kill the turtles in order to avenge him, and the cycle continues until Karai, who had been sent from Japan in order to unify the then-warring Foot Clan, offers to end the vendetta if the turtles help her eliminate one of the rogue factions, a deal which they take.
* In a sort of one-sided variation, old DCComics villain/antihero ''TheShade'' keeps being pursued by the descendants of a criminal he killed over a century ago.
* ''ComicBook/{{Scion}}'' was built on this trope. The Heron and Raven kingdoms fought each other for centuries without even remembering why before settling their differences by CombatByChampion. Ethan accidentally cutting Bron's face in a combat tournament leads to [[spoiler:Bron taking Ethan under custody, which leads to Ethan escaping, which leads to the Ravens declaring war on the Herons, which leads to Bron murdering Ethan's brother Artor in battle, which leads to Ethan going after Bron]], and so on and so on until [[spoiler:the Ravens and Herons unite against the invading Tigris kingdom]].
* This is the concept of Jango Fett's backstory comic series. It progresses thusly: Vizsla murders 10-year-old Jango's family. Jango helps the Mandalorians kill all of Vizsla's men and horribly scars his face. Vizsla leads the Mandalorians into a death trap and personally kills Fett's Mandalorian mentor. Vizsla frames the Mandalorians for mass murder and the Jedi kill all of them. Fett destroys Vizsla's ship, killing most of his men and savagely beats him down (though he gets a nasty beating in return). The cycle is ended when Fett slashes open Vizsla's belly, causing him to be set upon by a pack of predatory cats while Fett plays dead.
* This was [[Franchise/{{Batman}} Bruce Wayne's]] reasoning as to why he forbade [[Character/{{Nightwing}} Dick Grayson]] to take up the Mantle of the Bat and chose [[{{Azrael}} Jean-Paul Valley]] instead in ''ComicBook/{{Knightfall}}''. However, this turned out to be an even worse decision.
* In the ''ComicBook/TheAuthority: Kev'' miniseries, it's a RunningGag that Kev Hawkins keeps having to kill hit squads from either the Provisional Irish Republican Army or the Ulster Volunteer Force, who come after him because he killed a bunch of their mates in a previous miniseries... and of course, ''those'' guys were avenging ''another'' squad he killed in a previous miniseries... In the third miniseries, it's revealed that this all stems from a mission during his SAS days where he ended up killing folks from both sides of the conflict in Northern Ireland.
* ''ComicBook/NikolaiDante'' has to periodically deal with the [[ButtMonkey Arbatov clan]], who are constantly seeking vengeance for the deflowering, maiming, death, castration and humiliation of their relatives who had previously tried to avenge their family's honour, all the way back to the first issue, which has Dante discovered in the bed of Captain Arbatov's mistress. Unfortunately for Arbatov, he was courting the Emperor's daughter at the time, and was flayed alive when he brought a complaint against Dante.
[[/folder]]

[[folder:Film]]
* ''Film/SympathyForMrVengeance''. After Ryu is cheated by organ donors, he is forced into a disastrous kidnapping plot, triggering one long Cycle of Revenge.
* Similarly, in ''Film/{{Oldboy}}'', Oh Dae-su wants to find the mysterious 'Evergreen' and make him pay for imprisoning him for fifteen years. [[spoiler:It turns out that Evergreen is Lee Woo-jin, who was getting him back for carelessly outing an [[BrotherSisterIncest incestuous relationship he was having with his sister]] while they were back in high school, which [[DrivenToSuicide drove his sister to suicide]]. What's more, Lee's revenge was just beginning]].
* In ''Film/KillBill'', The Bride gets revenge on Vernita Green for having a hand in the massacre of her wedding party. But after killing her, The Bride realizes that Vernita's daughter, Nikki, had witnessed the whole thing and so The Bride says to Nikki, "When you grow up, if you still feel raw about it, I'll be waiting." Tarantino has said that he's interested in making a ''Kill Bill'' Vol. 3 in the future, where a grown-up Nikki Green hunts down The Bride, and a fourth film that elevates into this with [[spoiler:B.B. (Bill & The Bride's daughter) hunting down Nikki for killing her mother]].
* In ''Film/TheProposition'', Mr. Fletcher explains how to avoid one of these:
-->"There's a little something called the law of reciprocity. You kill one of theirs, and they kill one of ours. Here's a piece of general advice: if you're going to kill one, make sure you bloody well kill them all."
* The object lesson of the BruceLee film ''[[TheBigBoss Fist Of Fury]]''.
* In ''Film/CityOfGod'', the gang war is touched off by revenge against Lil Ze for [[spoiler:raping Knockout Ned's girlfriend and killing his brother and uncle]]. However, in a year, no one knows how it started, as everyone joins sides for revenge on the other side.
** With the notable exception of [[spoiler:the kid who kills Ned. He had joined NED'S side, telling them he wants to get revenge for his father's death. Turns out he was the son of the security guard that Ned killed near the beginning of the war]].
* In ''Film/AmericanHistoryX'', this trope is [[spoiler:played tragically straight, with a gang of [[UnfortunateImplications black]] [[TruthInTelevision bullies]] shooting Danny dead in retaliation for him pulling a BullyHunter on them the day before]].
* In ''Film/DeathSentence'', Nick (Kevin Bacon's character) [[spoiler:having his son killed in a gang initiation]], which leads to [[spoiler:Nick killing the guy who killed his son]], which leads to [[spoiler:the killers coming after him]], which leads to [[spoiler:Nick killing one of the killers]], which leads to [[spoiler:the killers killing Nick's wife]], which leads to [[spoiler:Nick killing the rest of the killers]].
* This is the entire basis of the film ''Film/ChangingLanes'': When each man refuses to budge and try to see things from the other person's shoes, they get stuck in a cycle of increasingly undiplomatic responses and revenge. Throughout the film, it is shown where each gets opportunities to end it by doing the right thing... opportunities that are, for the most part, promptly ignored.
* Discussed in ''Film/{{Troy}}''. Hector kills Patroclus in battle, so Achilles kills Hector, so Paris plans to kill Achilles. Briseis asks Achilles where it all ends, and he replies "It never ends".
* The ''Film/JoshuuSasori'' films develop a series of these across the first 4 entries. The protagonist's desire for revenge against the detective by whom she was seduced and betrayed fuels her repeated escape attempts. Thus, the guards hate her. This results in harsh punishments for all the prison inmates, which means they all hate her too, and they hate the guards almost as much. The warden hates her personally for causing all the trouble, and for the pain and embarrassment she's caused to happen to him personally. In the 2nd film, savage new inmate Oba sees her as a threat to her dominance among the prisoners, causing more betrayal down the line, and a new vendetta for Matsu. The 3rd film replaces the guards with detective Kondo, who takes her escape understandably personally. There's also the jealous woman downstairs from her, and old enemy Katsu to deal with. By the 4th film, every policeman and member of prison staff hates her passionately.
* The Danish film, ''InABetterWorld'', is extensively about this. In his EstablishingCharacterMoment, Christian, after being pushed down by the [[TheBully local schoolyard bully]], assaults the bully the next day, and beats him viciously by with a bicycle pump before threatening him with a knife to the throat. In this case, the bully, being rather understandably scared out his wits, promise to never ever to start anything with him again, [[DefiedTrope and actually keeps true to his word]].
-->'''Claus:''' "If you hit him, then he hits you, and then it never ends!"\\
'''Christian:''' "Not if you hit hard enough the first time."
** Of course Christian's worldview does come back to bite him hard, when he accidentally injures his best friend during another payback mission.
* ''CasperMeetsWendy'': Desmond Spellman wanted to kill Wendy to prevent her from becoming more powerful than him as predicted at a prophecy and, to make sure nobody would try to avenge her, he intended to kill her family.
* In ''Film/{{Taken}}'', [[PapaWolf Bryan]] slaughters the members of a human trafficking ring, including one named Marko, to rescue his daughter. In ''Taken 2'', the villains' [[EvenEvilHasLovedOnes families]], lead by Marko's father Murad, attempt to avenge them and attack Bryan and his family. Bryan attempts to end the cycle by sparing the life of Murad, but the man [[UngratefulBastard tries to kill him]] and Bryan kills him. Murad had two other sons.
* ''Film/ShotgunStories'' is about two feuding sets of half-brothers. The older set were born when their shared father was an abusive alcoholic. They crash his funeral and denounce him as an evil man, which enrages the newer family he made after reforming. The second set of brothers antagonize the first set in vengeance, triggering a cycle of revenge.
* In StevenSpielberg's {{Munich}}, the main protagonist, Avner, fears that he is treading down this path.
* In the final tale of ''Film/TalesFromTheHood'', a gangster shoots another dude for killing a friend. In his later rehabilitation, he is confronted by shades of people he killed, many as parts of other cycles, including some guys who hadn't even done the killing he killed them for. [[spoiler:In the end, he is gunned down by three other men in revenge for that last killing, who happened to be the three protagonists of the movie's framing device. In the end, it turns out that they too were slain for killing the guy in the last tale, and are currently in Hell.]]
[[/folder]]

[[folder:Literature]]
* Such a cycle between the settlers and the Eora is portrayed in ''Literature/TheSecretRiver''.
* [[LampshadeHanging Discussed]] in Isabel Allende's ''TheHouseOfTheSpirits'' regarding the acts of vengeance between the legitimate and illegitimate descendants of Esteban Trueba.
* Discussed or played straight several times in ''Literature/{{Beowulf}}'': The "Finnsburgh fragment" is a NestedStory about a feud between Jutes and Frisians, Beowulf himself predicts that peace between Danes and Heathobards will not be lasting because of this, and a subplot revolves around the traditional enmity of Geats and Swedes.
* Creator/EdgarAllanPoe's short story "Metzengerstein", in which two noble families have a perpetual feud based on this (and on an ambiguous prophecy). Ends with the last scion of Metzengerstein killed by a horse inhabited by the spirit of the lord of the other house, who apparently died in a fire the Metzengerstein heir started. Naturally, these events also fulfill the prophecy.
* Practically any [[HeroicFantasy fantasy novel]] by Creator/DavidGemmell.
* ''Literature/ASeriesOfUnfortunateEvents''. [[spoiler:The Baudelaires spend much of the series trying to bring down Count Olaf, who continuously tries to steal their fortune and is implied to have killed their parents. It is later strongly implied that the Baudelaires' parents had previously killed Count Olaf's parents.]]
* In Creator/DanAbnett's ''Literature/GauntsGhosts'' novel ''First & Only'', when the Jantine Patricians raid the Ghosts, Gaunt sends Corbec off to raid them back. When discussing what to do, Corbec declares that they should kill as many Jantines as Ghosts who died -- at least. (On the other hand, both raids had been part of a cover for deeper games, and part of the raid was to feed that cover, making it look like {{Revenge}}.)
** Also in that book, the reason that the Jantine/Tanith feud had started in the first place was that years before Gaunt took command of the Ghosts, he had executed the Jantine Colonel's father for desertion in the heat of battle, which had led to the death of Gaunt's father.
* The Literature/TheBible's story of [[ReligiousBruiser Samson]], from the Literature/BookOfJudges, consists mainly of a Cycle of Revenge: At one point, within a few verses, a Philistine commander claims "We just want to do to him what he did to us" and Samson claims "I just want to do to them what they did to me."
* Discussed in the Literature/NewTestament, when Jesus, in the Sermon of the Mount, rejects the practice of revenge in favor of [[TurnTheOtherCheek "turning the other cheek"]] ([[Literature/TheFourGospels Matthew 5:38]]):
-->''"You have heard that it was said, 'An eye for an eye, and a tooth for a tooth.' But I say to you, do not resist an evil person; but whoever slaps you on your right cheek, turn the other to him."''
* ''Literature/AdventuresOfHuckleberryFinn'': The Grangerfords and the Shepherdsons are [[FeudingFamilies engaged in a 30-year feud]], the origins of which are long since forgotten.
* A recurring footnote in any ''Literature/{{Discworld}}'' book discussing Dwarf/Troll relations explains that war cries such as "[[RememberTheAlamo Remember Koom Valley!]]" all tend to translate to "Let us remember the atrocity committed against us in the past that will excuse the atrocity we are about to commit today!" ''Discworld/{{Thud}}!'' in particular focuses on this theme, and particularly on an attempt at [[spoiler:''breaking'' the cycle. At its very beginning.]]
* ''The Corsican Brothers'' (The original, not the Cheech and Chong lampoon!).
* In Nick Kyme's ''TabletopGame/{{Warhammer 40000}}'' novel ''[[Literature/{{Salamanders}} Salamander]]'', in the BackStory, the 3rd Company had killed some renegades' captains; in the opening, they kill the 3rd Company's captain; shortly thereafter, the new captain goes in pursuit of them. [[spoiler:They get sidetracked by another issue, but happen on the killers, and get both the commander and the actual killer. Whereupon their captain is murdered after the battle.]]
* In Creator/AlfredLordTennyson's "The Voyage of Maeldune", the hero is told to forbear his revenge because
-->''And his white hair sank to his heels, and his white beard fell to his feet,\\
And he spake to me, 'O Maeldune, let be this purpose of thine!\\
Remember the words of the Lord when he told us, "Vengeance is mine!"\\
His fathers have slain thy fathers in war or in single strife.\\
Thy fathers have slain his fathers, each taken a life for a life,\\
Thy father had slain his father, how long shall the murder last?\\
Go back to the Isle of Finn and suffer the Past to be Past.'''
* In Saberhagen's ''[[Literature/BookOfSwords The Fourth Book of Lost Swords: Farslayer's Story]]'' The magical sword Farslayer, which can kill anyone from any distance, is hurled back and forth between two feuding families until only a few children are left alive.
* In Creator/HarryTurtledove's ''{{Timeline-191}}'', the Confederacy wins the Civil War and then, with help from Britain and France, defeats the USA in another war twenty years later. This leads to a culture of "Rememberance" and revanchism in the USA, who plan for victory in another war and make an alliance with Germany for that purpose. This comes during the Great War, when the USA soundly defeats the Confederates, who then embark on an even more brutal program of revanchism and preparing for the next war under Jake Featherston's Freedom Party. If this all sounds familiar, it's because the series is largely based off of European history (see the RealLife section below) moved to North America.
* The [[PlanetOfHats hat]] of the Arends in the ''Literature/{{Belgariad}}''. Polgara nearly falls into it herself in the prequel novel, but is strongly encouraged not to by her mother.
* ''Taras Bulba''. {{Cossacks}} vs. Poland and more personal RoaringRampageOfRevenge.
* In all of Literature/TheIcelandicSagas. ''Brennu-Njálssaga'', for example, follows Njáll and his sons as everyone pisses everyone else off and a lot of people get [[DisproportionateRetribution killed for some pretty petty reasons]].
* The Literature/InDeath series: The book ''Vengeance in Death'' is all about this trope. Roarke murdered six men to avenge the death of Summerset's daughter. Then the wife of one of the six men raises her son to murder six people who helped Roarke hunt down the six men, as well as Summerset, Eve, and Roarke to make a novena. Just goes to show {{Revenge}} has a lot of nasty consequences!
* ''Literature/AgeOfFire'': A recurring theme throughout the series, but especially highlighted in Dragon Avenger. Wistala eventually tries to end this in regards to the Dragonblade line by making peace with the current one and his family, rather than take revenge on him for killing her father.
* By the time of the first ''Literature/{{Dune}}'' novel, the Atreides and Harkonnen families had been feuding for millenia, and the feud only ended with the death of Feyd, Rabban and Vladimir (the last surviving members of the Harkonnen family, not counting Vladimir's unacknowledged daughter Jessica and her Atreides descendants) at the end of the book. The feud apparently started because at some point thousands of years earlier, an Atreides general had reprimanded a Harkonnen subordinate for botching an assignment (Something which is normally considered acceptable behavior for a senior officer when someone under his command screws up).
* Awareness of this trope, and a desire to avert it, is the reason beyond a particularly unsavory aspect of ''Literature/ABrothersPrice''. Families tend to be tightly knit and very collective. It would be easy for a family caught committing treason to pin it on one sister, who would be executed and leave the others alive and wanting vengeance. So, unless it's believed that this was not a proper family and sisters were not united - as happened to the Whistlers well before the story's start - the whole family is killed. Right down to the babies. Men - and Princess Ren - ''hate'' this practice and it's well established that ChildrenAreInnocent of their parents' crimes, but it's seen as ruthlessly pragmatic.
--> "Face the truth, Ren. She's [[spoiler: the [[BrotherSisterIncest incestuous fruit]] of the man who poisoned the Prince Consort and the woman who blew up half the royal princesses!]] Do you think any of even her most remote noble relations are going to take her? Do you think ''we're'' going to take her? You would ask our youngest to be raised with her? [[spoiler: Her father murdered ours.]] Do you think our babies would be safe around her once she realized that we [[YouKilledMyFather executed her mothers and grandmothers]]? [...] [[spoiler: Kij and Keifer]] had no good reason to hate you and me, except for deeds of our grandmothers. Do you really want their child, with better reasons for hating us, anywhere near our children?"
** The descendents of the surviving Whistlers bear no grudge against the crowns, and in fact some of them died fighting for the same people who executed their Mother Elder. They [[spoiler: adopt a traitor's child out of the charitable belief that there is redemption for the innocent.]]
* ''Franchise/StarWarsExpandedUniverse'':
** The planet Melida/Daan in ''Literature/JediApprentice'' has been split between the Melida and the Daan, who for many generations have been feuding over an original cause no one remembers - now each fights to punish the other for their most recent atrocity. All resources now go into fighting and memorials featuring recordings of the dead, urging the living to avenge them. The Young - the youngest generation - is sick of it.
** Nim Drovis (appearing in ''[[Literature/TheCallistaTrilogy Planet of Twilight]]'') has been in a civil war between the Drovians and Gopso'o for nobody-even-knows-how-long. According to legend, the civil war started from an argument about [[SillyReasonForWar whether "truth" was singular or plural]], but the combatants don't really care anymore.
* In ''GreekNinja'', it turns out to be the reason of everything that happened.
* Even Creator/DrSeuss got in on this with ''The Butter Battle Book'', a criticism of the UsefulNotes/ColdWar and MutuallyAssuredDestruction.
* ''Literature/ASongOfIceAndFire'' has this as its backstory: Rhaegar Targaryen absconded with Lyanna Stark, the heads of House Stark arrived at King's Landing to get her back, but got murdered. The remaining Starks and Lyanna's betrothed Robert Baratheon declared war and this lead to the deaths Rhaegar (at Robert's hands), his father, his children and his wife (by the Lannisters). The surviving Targaryens [[spoiler: as well as the Martells]] have vowed to get vengeance on Robert and his allies.
[[/folder]]

[[folder:Live Action TV]]
* ''TheBradyBunch'': "My Sister, Benedict Arnold" saw Greg and Marcia exercise this trope by bringing home dates deliberately picked out to annoy the other sibling. Mike and Carol make sure that neither Greg nor Marcia come out the winner, very bluntly pointing out that such behavior is unacceptable and makes them apologize not only to each other but to their "dates" as well.
* ''The Judge'': An episode of this 1980s courtroom TV series had a cycle of revenge story, where three college-aged students – two women and a man – raped each other in retribution for a previous rape one of them had committed against the other. Judge Franklin was so angry by the series of events he scolded them instead and refused to use his cheery "Be good to each other!" {{CatchPhrase}}, instead telling them to get out of his courtroom and warning that if he ever saw them again in his courtroom, they would go to jail.
* In one episode of ''{{Hustle}}'', the gang were hired by a guy's ex-wife to ruin his life because she painted a very unsympathetic picture of him, but as the episode progresses, it is really blurred as to which of them is more at fault.
* An episode of ''KungFu'', appropriately titled "''An Eye for an Eye''", focuses on this situation.
* The classic ''Series/DoctorWho'' serial ''The Caves of Androzani''. The psychotic Sharaz Jek plunges the Androzani system into a costly war for the sole purpose of getting revenge on the business partner who betrayed and permanently disfigured him. General Chellak, on the other hand, is willing to sacrifice virtually his entire force in a suicidal frontal assault against Jek's killer androids in order to kill Jek.
* The cycle of revenge has emerged as the driving force in the overarching mythology of the new ''[[Series/BattlestarGalacticaReimagined Battlestar Galactica]]''. "All this has happened before and all this will happen again."
* The closing episodes of the Filipino soap opera ''Kung Tayo'y Magkakalayo'' (English: "If We Were To Be Apart") deal with this, which involves Robbie Castillo, as he is engaged in a MexicanStandoff with Ringo Quijano, who's also Robbie's brother-in-law through his marriage with Gwen.
* One of the themes of ''Series/PowerRangersTimeForce''. Ransik, the BigBad, is a mutant driven to madness and violence by human hatred (supposedly, it's never shown and other characters claim that he was offered help), and he himself is responsible for causing both Time Force leader Jen and his own [[TheDragon Dragon]] [[TheStarscream Frax]] to hate ''him'' with a passion. The cycle ends when Ransik's daughter realizes that it's happening, and puts herself in mortal danger by going into the crossfire to convince him to let go of the vendetta. Ransik turns himself in, Jen accepts it, and Frax... well, Ransik already did him in by then, but he at least had time to reflect that his thirst for vengeance ruined him.
** ''Series/PowerRangersWildForce'' has it at one point when [[spoiler:Master Org is revealed to be Dr. Adler, a human scientist who became bitter because Cole's father married his mother before he could. He became so consumed by hate, he ate the remains of the original Master Org and brutally murdered them. When Cole finally defeats Master Org, reducing him to a helpless mortal man, he refuses to finish him off because he can see how Adler's hatred consumed him.]]
* One of these becomes a plot point late in the seventh season of ''Series/{{NCIS}}''. [[spoiler:A Mexican drug lord killed Gibbs' wife and daughter. Gibbs, being a scout sniper, killed the drug lord. Almost two decades later, the drug lord's son and daughter have taken over their dad's business and start taking revenge against Gibbs, threatening his team, his dad, and his mother-in-law, shooting off a finger from his mentor and killing another NCIS agent. Gibbs settles it (at least temporarily) by tricking the son into killing the daughter.]]
* ''MalcolmInTheMiddle'': When Francis reveals to Dewey that, despite the BigBrotherWorship Malcolm and Reese have for him, Francis was a BigBrotherBully when they were kids. [[ConversationalTroping Then they converse]] about this trope:
--> '''Francis:''' You know, you have a real opportunity here. [[DefiedTrope You can break the cycle.]] [[HopeSpot You can be a good brother to Jamie.]] You can be the ''one'' kid in this family who takes care of the younger one and looks out for him.
--> '''Dewey:''' [[ItsAllAboutMe How is that fair?]]
--> '''Francis:''' ''({{Beat}}.)'' You're right.
* One case on ''Series/NewTricks'' had the murder victim go to great lengths to break the cycle. A long running blood feud caused him to kill the patriarch of the other family so he fled to Britain, changed his name and went so far as to have his sister (his only remaining relative) be adopted by a British couple so she knows nothing of her heritage. He is killed but this finally ends the cycle.
* This is a central theme on {{Series/Merlin}}. King Uther is a KnightTemplar who has genocided all the magic users he can find. In retribution, quite a few magicians go overboard in their attack on him, attacking innocent civilians. Thus, Prince Arthur grows up being told that magic is evil and having it constantly proven to him. The eponymous Merlin, Arthur's manservant, best friend and secretly a warlock spends most of the series trying to convince Arthur to accept magic and therefore break the cycle, but his success has been limited.
* ''{{Bones}}'': A VictimOfTheWeek was the head of a [[FeudingFamilies Feuding Family]] not unlike the Hatfields and the [=McCoys=]. It all started when a man from one of the families and a woman from the other one were romantically involved and the two of them were poisoned. Each family blamed the other one. When the VictimOfTheWeek figured out neither half of the couple was at fault, he tried to put an end to the feud but his attorney[=/=]daughter-in-law killed him to continue making money off the lawsuits. (In modern times, the families resorted to suing instead of murdering)
* On ''Series/TheAmericans'' the Soviet and American intelligence agencies end up in one after a rogue faction of the KGB hire an assassin to kill some American rocket scientists. Philip and Elizabet are able to stop the assassin but not before three FBI agents are killed in a bombing. A group within the FBI decides to retaliate by kidnapping the Soviet KGB Rezident but end up kidnapping a low level flunky instead. It seems like the feud might end right there but then [[spoiler: Philip kills an FBI agent that is about to expose his cover]]. The FBI [[spoiler:kills the kidnapped Russian ]] and the CIA retaliates by killing a number of ranking KGB officials. The Soviet government declines to retaliate in the hope to end the pointless feud. However, [[spoiler: Elizabeth and Claudia]] were very close to one of the killed KGB officers and disobey orders when they target a CIA deputy director who was involved in planning the assassinations.
* ''Series/{{Grimm}}'': One episode's VillainOfTheWeek, a Bauerschwein, kills two Blutbaden [[RevengeByProxy because their sister Angelina killed his two brothers.]] It turns out that the two species have had a feud lasting for ages. In another episode a Bauerschwein chef is found to be putting a toxin into his meals that is fatal to Blutbaden but harmless to humans and other Wesen. He is completely indiscriminate in this and does not care that many Blutbaden have now forsaken the old ways and never killed anyone. In both cases Nick is able to use his position as a Grimm and a police officer to arrest the killers and prevent further retaliation.
* On ''Series/{{Justified}}'', the Givens and the Bennetts have been FeudingFamilies since Prohibition when a Bennett killed a Givens who supposedly turned him in for bootlegging. Half a century later, there is only a handful of people left in each family and the women of the families agree to a peace. However, there is still a lot of hostility between the families and a teenage Dickie Bennett attacks Raylan Givens during a high school baseball game. Raylan fights back and cripples Dickie's leg. Dickie is too afraid of his mother Mags to further retaliate but holds onto the grudge. In season 2, Raylan is forced to [[spoiler:kill Coover Bennett to save the life of a young girl]] and Dickie and Doyle Bennett swear out revenge. Mags once again orders them to keep peace but then Arlo Givens [[spoiler: robs Dickie during a drug buy]]. Dickie retaliates and [[spoiler:Raylan's step-mother is killed when he cannot find Arlo]]. Raylan arrests Dickie but Mags decides that she cannot abandon her son and takes his side. In the final bloody confrontation [[spoiler: Mags and Doyle die]] and [[spoiler: Dickie]] ends up in prison.

[[/folder]]

[[folder:Music]]
* Played straight in "Murder Go Round" by Music/InsaneClownPosse, which, contrary to popular belief, clearly isn't about a ride. It tells the story of a young hoodlum (played by Violent J) who is assaulted by a gang member, and decides to get him back, starting a gang of his own and killing his enemy and anybody who tries to avenge him. Eventually, he just starts killing people for the hell of it, [[spoiler:including his best friend]]. [[spoiler:It finally escalates to a gang war in which the hoodlum (running a street gang "fifty-five strong" and completely full of himself) is shot "twice in the forehead, twice in the back" and "twice in the eye", and only realizing in his dying moments how stupid and childish the whole endeavor was.]]
* Irishman Tommy Sands' song "There Were Roses" is based on a true incident experienced by the author. A Protestant was murdered, and a Catholic was killed in retaliation. The two had been close friends.
* The PerformanceVideo for ''Week End'' by {{Music/X Japan}} is this, combined with BolivianArmyEnding and EverybodysDeadDave - everyone dies in a chain of murders and suicides, all connected to the deaths preceding them. Yoshiki's wordplay about the "end of a life" being "the end of the world" in the lyrics matches this as well - the end of the life is the end of that person's world, and if the CycleOfRevenge kicks in, a chain of murder and suicide only grows and expands...
* The song ''S.D.I.'' by {{Music/Loudness}} references this in the context of the UsefulNotes/ColdWar and MutuallyAssuredDestruction. The CycleOfRevenge is about to take the world into [[NukeEm a final nuclear war.]]
[[/folder]]

[[folder:Religion/Mythology]]
* [[TheBible The New Testament]]: "You have heard that it was said, 'Eye for eye, and tooth for tooth.' But I tell you, do not resist an evil person. If anyone slaps you on the right cheek, turn to them the other cheek also. And if anyone wants to sue you and take your shirt, hand over your coat as well. If anyone forces you to go one mile, go with them two miles. Give to the one who asks you, and do not turn away from the one who wants to borrow from you. You have heard that it was said, 'Love your neighbor and hate your enemy.' But I tell you, love your enemies and pray for those who persecute you, that you may be children of your Father in heaven. He causes his sun to rise on the evil and the good, and sends rain on the righteous and the unrighteous. If you love those who love you, what reward will you get? Are not even the tax collectors doing that? And if you greet only your own people, what are you doing more than others? Do not even gentiles do that? Be perfect, therefore, as your heavenly Father is perfect." (Matthew 5:38-5:48)
* OlderThanFeudalism: The House of Pelops in GreekMythology.
** The ''Theatre/{{Oresteia}}'' by Creator/{{Aeschylus}} was written in response to this legend. It concludes with Orestes and Athena breaking the cycle once and for all by inventing the trial by jury.
**** Orestes nearly gets killed because he murdered his mother.
**** ...whom he only killed because she had murdered his father, King Agamemnon.
**** ...whom she had only killed because Agamemnon had sacrificed their daughter (Orestes's sister), Iphigenia.
**** ...whom he only sacrificed because the goddess Artemis demanded it of him.
**** ...and she only demanded it of him after he killed a deer in a sacred grove and boasted he was the better hunter.
**** As usual with Greek myths, there are actually several explanations why Artemis demanded Iphigenia's sacrifice, including one that was because Agamemnon's father had failed to sacrifice the first lamb of his flock to her, while according to Aischylos it was because two eagles (who symbolized Agamemnon and his brother Menelaos) had torn a pregnant hare to pieces, which enraged the goddess. And in the Iliad, Iphigenia wasn't sacrificed at all (Agamemnon offers the hands of all his three daughters in marriage to Achilles), while according to Euripides she was saved at the last moment and transported to Tauris (on the Crimea) to become a priestess at the local temple to Artemis...
**** The story is further complicated by Klytaimnestra (Agamemnon's queen) hooking up with Aigisthos, murderer of Agamemnon's father Atreus, who wanted to get revenge on Agamemnon for driving his father Thyestes (Atreus' brother) into exile from Mycene. (Because of an oracle, Thyestes had fathered Aigisthos by raping his own daughter Pelopia, in order to avenge his other children whom Atreus had killed). Aigisthos and Klytaemnestra together killed Agamemnon and Klytaemnestra for good measure also killed Agamemnon's prisoner/concubine Cassandra of Troy.
**** And all ''that'' came about from a curse on the House of Atreus from a man named Myrtilus, who Pelops killed after Myrtilus helped ''him'' murder King Oenomaus and marry his daughter Hippodameia to seize his kingdom. Granted, Myrtilus tried to rape Hippodameia, but Pelops still reneged on his promise to give Myrtilus half the kingdom.
**** Going back even '''further''', it's been suggested that part of the curse on Pelops and his descendants comes from the hubris of his father Tantalos, who originally murdered Pelops and tried to serve him in a stew to the gods. And then there was the fact that Tantalos had stolen the food of the gods and given it to his friends, along with telling them the gods' secrets. DisproportionateRetribution much?
* Another one pops up in TheOdyssey; Odysseus kills the suitors for revenge in abusing his [[SacredHospitality house's hospitality]] refusing any form of payment. Their families in turn blame Odysseus for wiping out another generation of the nobles of Ithaca (the first died during the Trojan War) and want revenge. It threatens to spiral into a civil war of revenge until [[DeusExMachina Athena drops down]] to declare the feuding over and threatens divine retribution on any who violate her orders.
[[/folder]]

[[folder:Newspaper Comics]]
* One ''ComicStrip/{{Doonesbury}}'' [[http://www.gocomics.com/doonesbury/2007/02/18 strip]] had an American soldier and an Iraqi soldier staking out a possible insurgent, with orders to capture him alive. However, the Iraqi soldier recognizes the insurgent and insists he must be killed, since a member of his family had killed a member of the soldier's family, and he is sworn to vengeance. When the American soldier asks when this happened, the Iraqi replies "1387".
-->'''American soldier''': What is the MATTER with you people?!
[[/folder]]

[[folder:Tabletop Games]]
* In ''TabletopGame/{{Warhammer}}'', the Dwarfs are in one of these as their natural state. In fact, they're capable of maintaining one without the other party trying to continue it. It works like this: someone does something to wrong them, so they write it down in the Book of Grudges and resolve to take bloody vengeance when they can. While doing so, the people they're attacking defend themselves, killing at least one dwarf. Well, that dwarf ''also'' has to be avenged. The dwarfish language [[LanguageEqualsThought has no word for 'forgiveness']].
[[/folder]]

[[folder:Theatre]]
* In the Creator/{{Shakespeare}}an dramas:
** There's some of this also in ''Theatre/{{Hamlet}}''. In the course of avenging his father, Hamlet ends up with Laertes after him for killing ''his'' father (which was, ironically enough, an accident). Though Laertes going after Hamlet wasn't simply because Polonius was killed, but rather because Ophelia committed suicide not long after, having gone bat-shit crazy upon hearing of her father's death.
** In ''Theatre/RomeoAndJuliet'', the Capulets and the Montagues alternately avenge every death that the opposing family caused. It's been going on for so long that the two warring families have forgotten exactly who started it and over what.
** ''Theatre/TitusAndronicus'' is one long and ''extremely'' bloody Cycle of Revenge between the title character and Tamora, the Queen of the Goths.
* The Jets and Sharks in ''Theatre/WestSideStory''; unsurprisingly, since the musical is modeled on ''Romeo and Juliet''.
* ''Theatre/TheMarriageOfFigaro'' is a bloodless variation of this- characters in an endless cycle of messing with each other's heads in revenge for what they did earlier in the show
[[/folder]]

[[folder:Video Games]]
* In DwarfFortress, one occasional cause of collapse is that if one dwarf goes berserk, they are liable to kill someone, leading thier family to get revenge on the killer's family, who then get more revenge, repeat until only one dwarf is left and they go insane.
* Sometimes, the already twisted path of revenge is even more non-linear than normal, thanks to time-space anomalies and reincarnation, as is the case in ''SoulNomadAndTheWorldEaters''. [[spoiler:One might invoke the wrath of another for avenging one's past self, while also unwittingly putting oneself on one's own hit list along the way somehow. That can't be good for the space-time continuum or anyone else involved!]]
* The ''StarWars'' extended universe, including KnightsOfTheOldRepublic, are chock full of these kinds of vendettas.
** Most of which get subverted to some degree or another, at least in the first KnightsOfTheOldRepublic game. Jagi wanted to take revenge on Canderous for allegedly abandoning his men during a battle to seize a tactical advantage. When facing down Jagi, one of the options is to point out that [[spoiler:Canderous probably saved a lot more lives by breaking from the battle plan.]] Jagi [[spoiler:commits suicide]] when he realizes that Canderous's actions were perfectly acceptable under the code of the Mandalorians.
** Bastila and her estranged mother, Helena, have a chilly reunion on Tatooine. Helena then requests that you go out to the desert to retrieve her [[spoiler:late]] father's holocron. When you do retrieve it, Bastila is tempted to keep it just to spite her mother. Turns out that Bastila's father was treasure-hunting [[spoiler:to fund the dying Helena's medical treatment]].
** If you're inclined towards Darkness, you can [[CorrupttheCutie encourage Mission]] to abandon her deadbeat brother to the Exchange (organized crime) in revenge for him abandoning her on Taris.
** Juhani brings up this trope when talking about her past, how "Those who had been wronged saw their chance at revenge. The oppressed became the new generation of oppressors" after [[spoiler:the Jedi left Taris to fight more battles against the Mandalorians]], bitterly lamenting that "the non-humans were never treated well in either case." There's also some cut dialogue for Juhani where she admits that she still hates and fears Mandalorians for committing genocide against her people, and voices her disapproval of Canderous among the crew. In one of the options, you can propose she go and kill him. She is still enough of a Jedi to balk at the idea of cold-blooded murder. However, when you meet up with [[spoiler:Xor, a mercenary who participated in the Cathar genocide, and who later murdered Juhani's father in a bar fight and tried to buy her as a slave]], those with darker tendencies can cheerfully encourage her to skewer the jerk on her lightsaber.
** And when it comes to subverting this trope, Carth's the master. His primary motive for 3/4 of the game is to get revenge on his former mentor (and to a lesser extent, all Sith) for destroying his homeworld, killing his wife, and [[spoiler:training his teenage son as a Dark Jedi]]. When he finally [[spoiler:kills Saul, Saul uses his last breath to take revenge on Carth]] by announcing his friend (if you play male) or lover (if you play female) is none other than [[spoiler:Darth Revan]]! After the last Star Map is found, Carth admits that revenge didn't give him any peace, and that he can no longer hate [[spoiler:you, despite what you have done as Revan]]. With a female PlayerCharacter, he elaborates further, saying that his promise to protect you has given him a new reason to live.
* To some degree, the motivations of most of the principal players of the ''VideoGame/MetalGearSolid'' series are wrapped up in revenge upon revenge.
* Happens in ''{{Shenmue}}'' with Ryo's father...
* Throughout the early parts of ''VideoGame/TalesOfSymphonia'', Lloyd gets pissed off at the way Desians treat humans. Kratos implies (in typical Tales fashion) that there's an underlying reason. There is: once they get to Tethe'alla, they learn that the half-elves there are victims of particularly cruel discrimination.
* In the JohnWoo game ''{{Stranglehold}}'', Tequila gets pissed at Wong for [[spoiler:[[FaceHeelTurn turning his partner against him]], [[OffingTheOffspring having Billie killed]], and then kidnapping Teko]], leading to the CowboyCop seeking vengeance upon him. Wong in turn hates Tequila's guts, which is why he didn't want him and Billie together to begin with, and he wants revenge himself on Tequila for [[spoiler:killing his son Johnny Wong from ''Hard Boiled'', who was behind the attack that killed his partner in the beginning of the movie and was very much an utter psycho deserving of death]].
* In the ''VideoGame/{{Touhou}}'' game, Imperishable Night, [[FinalBoss Kaguya Houraisan]] and [[BonusBoss Fujiwara no Mokou]] respectively want to kill each other as revenge for the numerous previous ''successful'' attempts on each other's lives -- they're immortal, and can regenerate even if their bodies are ''entirely destroyed''. And it all started when Kaguya rejected Mokou's father's marriage proposal, 1300 years ago. This is just one of Touhou's many moments.
* The reason behind the Alliance and the Horde being more or less openly at war in ''VideoGame/WorldOfWarcraft'' after being allies at the end of ''VideoGame/{{Warcraft}} III''. Some people just couldn't get over the fact that the enemy they had fought for so long wasn't an enemy anymore.
** On PvP servers, you can easily experience a Cycle of Revenge first-hand.
** A similar issue exists between two Outland factions, the Aldor and the Scryer. While they both are part of the same alliance, players are forced to choose between the two.
** Camp Taurajo in the Southern Barrens becomes the start of one. The Alliance sacks Taurajo, the Horde responds by killing the General who carried out the attack, and the other Alliance leaders swear vengeance on the Horde for the assassination. Ironically, General Hawthorne was trying to avoid civilian casualties because he didn't want a Cycle of Revenge, but didn't factor in the quillboar who were mortal enemies of the Tauren.
*** It's also hinted he didn't count on the rabidly anti-Horde ambassador. The Ambassador's interest in the Horde's desire for revenge, the easily located spy with an itinerary for the General's journey, and the speed with which a replacement is found are too convenient. This Cycle was planned.
** Taran Zhu, leader of the Shado-Pan, calls both sides out on this in the latest patch:
--->'''Taran Zhu:''' ENOUGH!! There will be no more bloodshed today. I see now why your Alliance and Horde cannot stop fighting. Every reprisal is itself an act of aggression, and every act of aggression triggers immediate reprisal. [...] SILENCE! YOU must break the cycle. It ends TODAY. Here. The cycle ends when you, Regent Lord, and you, Lady Proudmoore, turn from one another. And walk. ''Away.''
* Subverted in Kung Lao's ending of ''VideoGame/MortalKombat Gold''; he attacks the Shokan Goro during a peace treaty signing as a ceremonial strike of revenge for Goro's brutal murder of his ancestor in an earlier MK tournament. Goro naturally believes that Lao is wanting to continue the fight for vengeance, but Lao tells him no, the attack was just to let the big lug know he hasn't forgotten what he did all those centuries ago, but is willing to put aside their differences for the sake of peace. Goro agrees, hinting that were his and Lao's ancestor's fates were reversed, Goro's own son would've likely been the one asking Lao (or his ancestor, since being Champion of MK gives you natural immortality) for peace.
* The {{Killzone}} series sets this up. The feud between Helghan and the ISA goes back for generations, with the actions of the series being the Second Intersolar War.
* Subverted in ''VideoGame/TalesOfLegendia''. Near the end of Chloe's character quest in her confrontation with Stingle, the man who killed her parents to get money for his sick daughter, she is all but willing to kill him... until his daughter, whom she had grown close to at that point, picks up her father's sword, swearing to protect her father and take revenge upon Chloe if she kills, helping to snap Chloe out of her growing KnightTemplar attitude.
* ModernWarfare, in spades, occasionally [[LampshadeHanging lampshaded]].
* The Nature of the Beast Quest in ''VideoGame/DragonAgeOrigins'' revolves around a vicious Cycle of Revenge. Long ago, a group of humans attacked the Dalish Elves in the Brecilian Forest, killing the son and raping the daughter (who was later DrivenToSuicide) of the elven Keeper Zathrien. In his rage and grief, Zathrien summoned a forest spirit and bound it in the body of a wolf [[BloodMagic using his own blood]], creating Witherfang. Witherfang then cursed the humans, and turned them into the first werewolves. Centuries later, those humans' descendants are still cursed. Under the guidance of Witherfang (who has recently gained sentience and intelligence as the Lady of the Forest), this new generation of werewolves are attacking the Dalish and spreading the curse to them, partly for revenge against Zathrien (who is still alive because he is bound to Witherfang) and partly because they are trying to force Zathrien to undo his curse. The werewolves believe they are being unfairly punished for their ancestors' crimes. Zauthrien believes that their current actions prove that they are just as savage as their ancestors and deserve the curse no less. Ultimately, it's up to you to decide how this cycle is resolved.
** Even if you cure the werewolves and end the curse, the cycle threatens to perpetuate itself with Dalish elves who now want revenge on the former werewolves for killing members of their clan. Hawke can encounter the daughter of a Dalish hunter-turned werewolf in ''VideoGame/DragonAgeII'' who is threatening to murder one of these former werewolves. Hawke can choose to peacefully resolve the situation, leave the former werewolf to his fate or kill the elf and her companions.
*** This Trope also comes to play if you're a Human Noble. The Warden avenges his/her parents' murders by killing Arl Howe during the last 1/4 of the game. Later, in ''VideoGame/DragonAgeOriginsAwakening'', one of your first party member candidates is his son Nathaniel, who was about to assasinate the Warden as a revenge for his father's death, but got captured for trespassing before he had the chance to slip a dagger between his target's ribs. Part of Nathaniel's CharacterDevelopment later on is cutting the cycle once he learns and understands what a bastard his father was and that he had it coming.
* NoMoreHeroes: the final boss in the first game says as much without going into all the symbolism, but the second game does this even more. The first boss is Helter Skelter's younger brother who wants revenge. Matt Helms killed his parents as a ghost for leaving him in a burning house to die. Two assassins come back to fight you despite dying in the previous game. [[spoiler: And the final boss, Jasper Batt Jr. has Bishop murdered at the start of the game out of revenge for Travis killing his father and two brothers in the side missions in the last game, something the player probably doesn't even remember.]]
* Invoked in the ''{{Burnout}}'' series, namely Revenge onward. It keeps track of everybody you've started a rivalry with, and rewards you for getting revenge or keeping your rival from doing so.
* ''SaintsRow2'', as mentioned in other {{Revenge}} tropes, particularly the Brotherhood arc. An interesting aversion by Johnny Gat, the most psychotic killer in both games; even though his LoveInterest was slain, killing all the Ronin was no more or less the same business it was before, just a little more personal. The other revenges through the remaining arc hardly seem connected to each other.
* The single-player campaign of ''[[{{VideoGame/Tribes}} Tribes: Vengeance]]'', true to its subtitle, is driven almost entirely by someone's desire for revenge and the protagonists are rotated all the time.
* The entire point of Creator/{{Cactus}}'s short "art game" ''Space Fuck!''. Two neighboring planets in space; every thirty years, on one of the planets, a warrior comes out of the tunnels where he lived his entire life, and finds ruins of a thriving city on the surface. A survivor tells him that a man from the other planet massacred everyone. The warrior decides to get revenge, hops into a ship that happens to be nearby and flies to the other planet to massacre the inhabitants there. Then he descends into that planet's tunnels, meets a woman and has a son with her. Thirty years later, the son comes out of the tunnels and finds ruins of a thriving city on the surface, and learns that a warrior from the other planet is responsible. He decides to get revenge on the other planet, flies over there and kills everyone, then descends into the tunnels where he meets a woman... After a couple iterations, the game outright announces: "Vicious Cycle".
* In a warped way, this is what the Bogeyman embodies in ''VideoGame/SilentHillDownpour''.
* Lara Croft and Werner Von Croy use the trope on each other throughout ''Franchise/TombRaider: The Last Revelation'' and the final chapter in ''Tomb Raider Chronicles''. Teenage Lara goes on an expedition with Von Croy and is forced to leave him behind when his tampering with the Iris artifact causes the area to collapse and traps him. Von Croy is rescued some time later and keeps the artifact while being bitter towards Lara who he thinks abandoned him. Lara then infiltrates Von Croy's research building and steals the Iris artifact from him. This in turn causes Von Croy several years later to seek revenge by hiring mercenaries to stop or kill Lara in Egypt so that he can claim the Amulet of Set (succeeding) and then he goes on to capture Lara's friend, holding him hostage in exchange for the Armor of Horus. After Lara's apparent demise when the pyarmid she is in collapses as Von Croy watches in horror, Lara escapes some time later in ''[[VideoGame/TombRaiderAngelOfDarkness The Angel of Darkness]]'' and is angry at Von Croy for leaving her back in Eygpt. The entire cycle of revenge is finally broken when a third party unrelated to the two characters kills Von Croy.
* A variation is the key story trope of ''InfinityBlade''. The game starts off with the tyrannical God King killing one who opposes him. Then, some 20 years later, that man's son comes to avenge him -- and after fighting through the God King's castle, also gets killed. And so on, and so on, until you either manage to kill the God King, or fight him to a standstill and agree to join him. In the former case [[spoiler: you've accomplished ''nothing'' except making some powerful new enemies who have no reason to hold the man who killed the God King in any higher regard than they held the God King. Then, [[GameplayAndStorySegregation you skip to the next in the bloodline avenging his father, because the game is built around this preconception]].]] In the latter case [[spoiler: you find out the God King was '''one of the good guys''' -- unlike the ''other'' Deathless, he doesn't think that being immortal gives him license to be a colossal jerk for no reason, and the whole exercise was ThePlan to lure powerful warriors to his castle, where he'd either kill them to enhance his power or recruit them as his champion so he could take on the others.]] If that isn't pointless enough, the sequel reveals that [[spoiler: your character wasn't ''actually'' avenging anyone in the first place. He's an amnesiac immortal, with each reincarnation believing his previous incarnation to be his dead father in need of avenging.]]
[[/folder]]

[[folder:Webcomics]]
* Played with by the ''Webcomic/GirlGenius'' cast and their {{Parental Substitute}}s: the cycle tries to roll on, and is promptly... not exactly ''broken'', more like ''[[http://www.girlgeniusonline.com/comic.php?date=20100512 derailed]]''.
* This is a central theme of the "Hivebent" arc in ''Webcomic/{{Homestuck}}'', especially when it comes to [[SmugSnake Vriska]] and her dealings with [[VigilanteMan Terezi]] and [[EmotionlessGirl Aradia.]] [[ArcWords Make Her Pay]].
** In chronological order: Vriska cripples [[TheWoobie Tavros]], Aradia sends ghosts to torment her, Vriska mind-controls Aradia's boyfriend into killing her, Terezi informs [[HumanoidAbomination Doc ]][[PhysicalGod Scratch]] about one of his items currently owned by Vriska - which he then explodes, blowing off Vriska's special eye and an arm; Vriska then pulls out a three-step mind-control reacharound to make Terezi stare into the sun and go blind. ''It all happens in an immediate succession''. Some time later, after Tavros, with whom everything started, has apparently forgiven her, Aradia (now as a ghost inhabiting a robot) delivers a near-fatal [[MindOverMatter beatdown]] to Vriska. After Vriska [[BackupFromOtherworld awakes as her dream-self]], Terezi merely slaps her, ending the cycle.
** [[spoiler:Some time later, Tavros decides that Vriska must be stopped (after more KickTheDog moments from her) and attacks her, getting [[KilledOffForReal irrevocably killed]] in retaliation. Terezi finds his body and immediately deduces who did it, starting the cycle anew.]]
** The cycle is finally broken [[spoiler:when Terezi kills Vriska to stop her from following a course of action that would doom the other Trolls.]]
** It is then revealed that the cycle began ''earlier'' than that. As in, during their ancestors' time.
* The plot of ''{{Juathuur}}'' is for the most part about this. Thomil is the only one concerned with actually breaking the cycle.
* In ''Webcomic/TheOrderOfTheStick'', the conflict between the Sapphire Guard (an order of LawfulGood [[KnightInShiningArmor Paladins]]) and the [[SubvertedTrope allegedly]] AlwaysChaoticEvil goblin races is a perfect example of this. The story makes it abundantly clear that both sides are at fault, but that the destruction of Azure City at the hands of [[TheDragon Redcloak's]] hobgoblin horde is a direct consequence of the Azurites' [[KnightTemplar arrogance]] in engaging in a preemptive genocidal crusade. For his part, Redcloak is only too happy to continue the cycle of atrocities.
** Vaarsuvius also gets some quality time with this trope in the arc with the vengeful black dragon and goes to some [[DisproportionateRetribution rather extreme steps]] to end it. Unfortunately, this comes at the price of [[DealWithTheDevil owing his/her soul]] to some fiends who don't plan to wait for his/her death to collect, ''and'' s/he still gets hunted by agents of Tiamat, the goddess of vengeance and chromatic dragons, who is less than pleased about a full quarter of the black dragon population getting wiped out of existence thanks to V.
*** Oh, and those "extreme steps"? [[spoiler: They killed off a plot-relevant family of NPC guardians, leaving one of the Gates defenseless. ]]
[[/folder]]

[[folder:Web Original]]
* Happens in the [[TheYogcast The Blackrock Chronicles]]. First Sjin attempts to steal from Duncan, who attacks Sjin in retaliation, leading to a massive Tekkit Server war that destroyed pretty much everyone's game. The plot of Rythian's series then involves him heading out to get revenge against both Duncan and Sjin. Duncan, fearing Rythian's warmongering, traps him in a forcefield and builds a nuke under his castle, while Sjin kidnaps their Dinosaur and it all just escalates from there...
* The fake feud between WebVideo/TheNostalgiaCritic and WebVideo/TheAngryVideoGameNerd was like this at first as both countered perceived slights, before turning into a general hatred that culminated in a decisive final battle. Twice, actually. It's all a joke, so that much is deliberate.
** The feud has been settled and started up again twice as well, finally being settled for good (for now at least) in ''WebVideo/ToBoldlyFlee''.
* In the ''GlobalGuardiansPBEMUniverse'', Ultra-Man and Baron Malthus have been battling each other since World War II. It stopped being about "preventing injustice" (for Ultra-Man) or "committing a crime" (for Baron Malthus) a long, long time ago... no, these days [[ItsPersonal it's strictly personal]].
* In the second Jobe story of the WhateleyUniverse, Jobe and Counterpoint get into a cycle of revenge at SuperheroSchool Whateley Academy. Jobe wins a sparring match in aikido class, but he does it with poisons (Jobe starts the story with human strength and speed, just talent as a bio-devisor, while Counterpoint has strength, speed, a telekinetic shield, and any other powers he wants to copy). Counterpoint can't let it go, since he's some sort of incarnation of Ares. He gets some muscle to help him pound Jobe. Jobe can't let it go, since he's the crown prince of Karedonia (his father is a supervillain) and has obligations to make sure people know he can't be pushed around. At the end of the story, they are both in the hospital, and at least one of them might be hospitalized for a long time. And they haven't given up their grudges.
[[/folder]]

[[folder:Western Animation]]
* ''WesternAnimation/{{Gargoyles}}'' grabs hold of this theme firmly from multiple angles. Goliath wants revenge against the Vikings for his clan's genocide, Macbeth wanted revenge against Demona for her treachery, Demona wanted revenge against all humans... the list continues on, right down to a nameless guy who is always being shafted by the Gargoyle exploits, [[spoiler:who was able to break his own cycle by settling for shooting a Gargoyle in the face with a Pie Cannon.]]
** By the end of second season, Macbeth and Goliath manage to drop their respective beefs, but Demona never lets go of her vendetta against humanity (WordOfGod has stated she eventually will, thanks to her [[MoralityPet daughter]]), and she in turn is pursued by a family of Hunters sworn to kill her.
** Two of the three most recent Hunters drop the axe thanks to Elisa's influence and the realization of how much their blood feud has cost them (up to and including one of them ending up paraplegic), but the nicest of the three [[BewareTheNiceOnes snaps]], and the cycle is perpetuated. Interestingly, the leader of the three most recent hunters admits it has been long forgotten why they hunt Gargoyles. All they know is that it is their family legacy.
** There was pretty much a Seesaw of Revenge going on in the backstory, starting in 997 and possibly ending in 1058: In 997, Gillecomgain's father, Mail Brigti, was killed in battle against Findlaech, and although Findlaech didn't strike the killing blow (and didn't even want to kill Mail Brigti anyway), Gillecomgain still blamed Findlaech for Mail Brigti's death. Then, in 1020, partly to avenge Mail Brigti and partly because Duncan commanded it, Gillecomgain murdered Findlaech. In 1032, Findlaech's son Macbeth learned that Gillecomgain had killed his father and killed Gillecomgain for revenge; then, in 1040, he learned that Duncan had demanded his father's death and killed Duncan as well. In 1057, Duncan's son Canmore "killed" Macbeth to avenge Duncan, and Macbeth's son Luach swore vengeance against Canmore. Whether the cycle was broken [[spoiler:when Luach died in battle against Canmore in 1058]] is debatable.
** Gargoyles does contain one aversion to this trope. Xanatos refuses to pursue revenge on any of his enemies, calling it "a sucker's game". Judging by what happened to the other revenge seekers on this show, Xanatos may be right. [[spoiler:Xanatos did pursue revenge, albeit reluctantly, in "Double Jeopardy," but he was also thoroughly defeated by Thailog in that episode.]]
** This exchange highlights it beautifully.
-->'''The Sisters:''' You must give them the code.\\
'''Demona:''' (''In a trance'') I will have vengeance for the betrayal of my Clan... Vengeance for my pain.\\
'''The Sisters:''' But who betrayed your Clan? And who caused this pain?\\
'''Demona:''' (''Getting agitated'') The Vikings destroyed my Clan!\\
'''The Sisters:''' Who betrayed the castle to the Vikings? (Note: It was Demona.)\\
'''Demona:''' The Hunter hunted us down.\\
'''The Sisters:''' Who ''created'' the Hunter? (Note: Demona did)\\
'''Demona:''' Canmore destroyed the last of us...\\
'''The Sisters:''' Who betrayed Theatre/{{Macbeth}} to Canmore? (Note: Demona)\\
(Pan to wide-eyed [[MyGodWhatHaveIDone 'What have I done']] look on Demona's face)\\
'''Goliath:''' Your thirst for vengeance has only created more sorrow. End the cycle, Demona... give us the code...\\
'''Demona:''' (''Tears forming while saying slowly'') The access code is...[[spoiler:[[TearJerker alone]].]]
* In ''WesternAnimation/JonnyQuestTheRealAdventures'', the Quest kids find themselves caught in a hidden war between the descendants of loyalists from UsefulNotes/TheAmericanRevolution and the Continental Army agents sent to kill them. The original point of the fighting (recovering the original Declaration of Independence, which the Loyalists stole) is all but forgotten (not to mention 200 years moot), and is primarily boiling down to killing the guy on the other side for [[YouKilledMyFather killing your father]], or him coming after you for killing his (usually both).
* In ''WesternAnimation/TheLegendOfKorra'' has one in [[spoiler:Yakone's family. Yakone was a vicious mob boss who was an extremely powerful bloodbender, forcing Aang to take away his bending. Yakone raised his children as {{Tykebomb}}s to take revenge on Republic City and the Avatar for this. This abuse caused one of his sons, Noatak, to seek revenge on Benders in general, becoming [[BigBad Amon]], while his brother Tarrlok ended up becoming a pseudo-fascist politician with ambitions of ruling Republic City. Ultimately, both brothers ended up becoming Yakone's instruments of revenge, in spite of their attempts to escape his plans. Tarrlok finally ends the cycle by [[HeroicSacrifice killing himself along with Amon]], ending Yakone's legacy along with them.]]
* ''WesternAnimation/{{Thundercats 2011}}'' has this as an undercurrent of the generations-long war between the [[{{Catfolk}} Cats]] and the [[{{Lizardfolk}} Lizards]]. Implicitly, this is Lizard General Slithe's motive over a long career of fighting the Cats.
* Ultimately subverted before it could truly begin in the ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' episode "[[Recap/MyLittlePonyFriendshipIsMagicS3E4OneBadApple One Bad Apple]]." In it, Apple Bloom's visiting cousin, Babs Seed, joins local mean girls Diamond Tiara & Silver Spoon in bullying the Cutie Mark Crusaders to the point that they employ a BatmanGambit prank to get her back. However, when told near episode's end that [[spoiler: Babs herself had been a victim of bullying due to her lack of Cutie Mark]] the Crusaders realize part of what drove her actions and try to stop what they've begun so as not to become bullies themselves.
[[/folder]]

[[folder:Real Life]]
* As already mentioned, a widely common phenomenon in cultures all over the world before the emergence of public prosecution, public executive (in other words, police), prison sentences (and, well, public prisons), and the state's monopoly of violence in general. Before these things became institutions, people all over the world used to take justice and the enforcement of laws and sentences into their own hands.
** This is possibly the natural state of affairs when there is no organized society. All conflicts are resolved with physical violence and revenge is the sacred duty for the wronged lest the wronged lose his honor. This happens also everywhere where central government is weak, remote or effete. Once such a culture of honor and vendetta has been born, it is almost impossible to weed out.
* To prevent cycles of revenge from going on forever, or turning into ''spirals'' of revenge, the Anglo-Saxons, as well as many other medieval societies had the institution of "wer-gild", or blood money. Someone outside the feud would come in and decide who had suffered the most (i.e., which side had suffered the most murders). The side that had suffered less would then have to pay a fine to the others' side proportional to the overzealousness of their revenge killings.
* There are several tribes particularly in South America and Africa that are plagued by this, having been stuck in perpetual warfare for generations because each death must be avenged with death.
* The culture of Vendetta on the islands of Sicily and Corsica caused this kind of thing to happen until very recently (and maybe it's not quite all over yet).
** On Corsica, this combined with the [[http://en.wikipedia.org/wiki/Corsican_nationalism separatist movement]] and the tendency of both feuding families and separatists to use bombs as weapons of choice has led to the stereotypical association of the island in French media (including [[FrancoBelgianComics comics]]) with the onomatopoeia ''[[StuffBlowingUp boum]]''.
** This cycle of vendetta has led in many regions to severe depopulation as all males have either been killed or forced to flee due to centuries of vendette. In Albania it is commonplace in such situation for a woman to take the gender role of a male (to have "social sex change").
* A lot of gang violence boils down to this. Most being retaliations for other gang hits.
* UsefulNotes/WorldWarOne. The Christmas Truce of 1914, as well as the general 'live and let live' attitude of 1914-15 (in which there were unofficial ceasefires wherein both sides tacitly agreed not to shoot each other), were unthinkable by the end of 1916. Too much blood had been spilt, everyone had lost too many friends, and the General Staffs on both sides had tried to encourage agression by frequent patrols/'trench raids'. The result was a sort of savage joy in the opportunity to kill the enemy in defensive engagements (in which they would be vulnerable to machine-gun fire) and to 'get at them' (in hand-to-hand fighting, preferably) when on on patrols/raids or on the attack. The CycleOfRevenge is the main reason that the armies engaged on the Western Front (French, British, German, Italian, Austro-Hungarian) didn't simply fall apart from low morale, despite numerous rebellions by French troops and the enormous underlying resentment for what was basically a pointless war.
* [[ArabIsraeliConflict Israel/Palestine]] [[RuleOfCautiousEditingJudgment may or may not be this.]]
* The Hatfield-[=McCoy=] feud, which, according to popular lore, began with a dispute over a hog and eventually led to the murder of dozens of people. (The real reason for the feud probably had more to do with jealousy and a dispute over property rights in the valley where both families lived.)
* Most wars between Maori tribes were "revenge wars", where they would try and get "utu" for their fallen chief, by killing the other tribes chief.
* In Northern Ireland during UsefulNotes/TheTroubles, cycles of revenge killings known as "tit for tat killings" were very common. Where random protestants or catholics were killed within hours of another killing-which would lead to another random killing.....
* Germany & France between 1870 and 1945. Germany's resounding victory in the Franco-Prussian war and subsequent annexation of territory led to 40+ years of "[[http://en.wikipedia.org/wiki/Revanchism Revanchism]]" (from the French ''revanche'', meaning "revenge") being a dominant political movement in France and to France seeking alliances and preparing for another war with Germany. And then the ethnically-German Habsburgs' Generals use the excuse of Archduke Franz Ferdinand's assassination to annex Serbia, which indirectly (once Russia committed itself to supporting Serbian independence) gave France an excuse to participate in UsefulNotes/WorldWarI once Germany had demanded they give up several strategic fortresses (upon threat of war). A decade-and-a-half after the French & Allied victory in UsefulNotes/WorldWarI, the Nazis came to power and (eventually, once war broke out over Poland) pursued their own agenda of revenge against France. Luckily after UsefulNotes/WorldWarII, in which both nations were devastated and left reliant on US support in the face of possible Soviet aggression, they decided to work together...
** It went back further than that. From a German point of view, 1870/71 was payback for the humiliating defeats of the NapoleonicWars (yes, they had beaten Napoleon in the end, but not without help from other great powers, most notably Russia and Great Britain). While in France, the victory of Jena and Auerstedt in 1806 was seen as revenge for the humiliating defeat at Rossbach against the Prussian army in 1757 during the SevenYearsWar, which in turn was seen by Germans as revenge for Louis XIV's wars of aggression, and so on until the middle ages. People in all seriousness talked of the "hereditary enmity" (''Erbfeindschaft'') between Germany and France, but that term actually first was coined to describe the long-running enmity between the houses of Habsburg (Austrian Archdukes, Dukes of Burgundy, Kings of Naples and Sicily, Holy Roman Emperors, and sometime-Kings of Castile and Aragon [Spain]) and Valois/Bourbon (Kings of France) that went back to Francis I of France and the accession of Charles V Holy Roman Emperor in 1519.
* Sadly, TruthInTelevision amongst the Gypsies (Roma and Sinti people). They are known to have the blood feud culture with HairTriggerTemperament and vendette existing for centuries.
* The Norsemen during the [[HornyVikings Viking age]] were infamous for this. If a man felt wronged by another, meaning an insult or an act of violence, there were four ways to resolve the conflict.
** They could reach a settlement, tallying damages for both parties and having one pay a restitution to the other. Any man was honour-bound against breaking such a settlement.
** Next there was the option of taking revenge. If a family member had been killed, his relatives as far related as cousins (including in-laws) were obligated to avenge the victim. With communities being small, it wasn't that uncommon for men to have to choose families as they had relatives in both, and usually, it ended up with entire communities fighting for generations. A man was honour-bound to avenge an unsettled vendetta, and the only alternative if he was unable or unwilling was fleeing the country.
** If a Viking wanted revenge without starting a blood feud, they would sometimes make their case at a ''thing'' (a court of chiefs and nobles). And while revenge killings were considered good and just, legal action was seen as underhanded and hostile, and as such was reserved for only the most serious of circumstances. Sentences were fines, banishment, or being declared {{outlaw}} (effectively a dishonourable, unavengable death sentence for you or anyone who helps you).
** Lastly there was the option of demanding a TrialByCombat. This meant either death, or a verdict of banishment or outlaw, for the loser, with a risk of death from wounds for the victor too.
*** Blood revenge continued in the Norse-lands even as they became monarchies, with the chieftains as nobles and jarls, until the 1200s, when the practice was banned in Norway and Sweden and replaced with courts and laws.
* The Montenegrins in particular are especially infamous for this. It even has its own name: [[http://en.wikipedia.org/wiki/Krvna_osveta Krvna Osveta, Blood Feud]]. Though it isn't as common nowadays, it still does happen in more remote areas.
* The Balkans in general. The breakdown in Yugoslavia involved (at least per the excuses given): Serbians taking revenge on Croats for siding with the Germans in World War 2 in revenge for the Serbians doing something to the Croats even earlier, and everyone against the Muslims due to the Turkish invasions of the 1500s, and so on and so forth. And then there are the Greeks and the Turks...for everyone else in the area, the joke goes that they're starting to get over grudges dating back to the Roman Empire. The Greeks and the Turks involve a revenge cycle going back to Classical Greece and the Persian Empire.
* Sadly, this is TruthInTelevision and a common FreudianExcuse for RealLife school bullying and cyberbullying cases. Some victims of school bullies eventually snap and go on a school shooting. Victims of cyberbullying who commit suicide will eventually lead to their friends or families hunting for the cyberbully's blood.
* In intelligence circles, this is known as "blowback."
* In the WarOf1812, the British would commit war crimes on American settlements in response to "American savagery" inflicted on British-American settlements, which in turn would cause the Americans to burn more British settlements, in revenge for "British savagery". The most triumphant example of this was when the Americans burned the Canadian city of York (modern Toronto, the largest city, and the De facto capital of British Canada at the time) only for the British to respond by torching the public buildings of Washington DC. In the same war, soldiers from both sides would routinely collect the scalps from the corpses of enemy soldiers as trophies. Newspapers on both sides demonised the other side for this practice, calling their enemies "little more than Indian savages", but at the same time, newspapers would be willing to turn a blind eye to this exact same activity on their own side. Since the war ended with the exact same borders that existed before the war, neither side gained anything from this activity except a bunch of burned down ruins where wealthy and thriving cities used to be, a large number of dead or displaced civilians, and a massive reconstruction bill costing thousands of pounds for both sides. [[SarcasmMode But hey, at least they got a nice scalp collection out of it!]]
* A somewhat humorous variant occurs sometimes in Japan. When one person gives another a gift, it is often considered polite to give a "thank you" gift in return. This can occasionally prompt the first person to give ''another'' gift, until neither party wants to "lose" by being the first to not give a gift.
[[/folder]]
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