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This trope is when the hero and the villain (or any two people at odds with each other) happen to cross paths, purely by coincidence. This might happen at some particularly dramatic moment, though this isn't always the case. Perhaps one of them made a mistake, or the other just got lucky, but in either case, the main point of this trope is that they are both ''surprised'' by the encounter, but unaware of who they were until their next meeting. By the time the encounter ends, one of them would look back to see who that ''person'' was, as they feel as something unusual had occurred for a slight moment.

For example, Alice may be infiltrating Bob's secret lair. She finagles her way past all the guards and security systems, finally making her way into Bob's inner chamber. Just as she cracks Bob's safe, filled with all his secrets... a toilet flushes in the adjoining room and Bob steps out zipping his fly, unaware that anything had been amiss. Until now, that is.

Another (and more likely) scenario is when the hero and villain simply happen to cross paths without either being consciously aware that the other would be present beforehand. In some cases, they may not even realize who they saw until sometime afterward, when someone else mentions them. Or it could be the SecretIdentity is revealed and the hero had been LivingWithTheVillain all along.

A SubTrope of ContrivedCoincidence. Also compare VillainsOutShopping, which is one of many possible setups for such an encounter.
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!!Examples:

[[foldercontrol]]

[[folder:Anime & Manga]]
* This is a staple in the various ''Franchise/{{Gundam}}'' series, with the heroes typically meeting their enemies by accident while out of their respective mechas and uniforms.
** Late in the original ''Anime/MobileSuitGundam'', Amuro and Char meet on a road in the neutral colony of Side 6 and Char even helps the young soldier get his car out of a ditch. While Char is quite famous in-universe, Char does not learn the name of the Gundam pilot he's been fighting for the whole series until after this encounter. Earlier, Amuro ran into Zeon officer Ramba Ral in a tavern after (temporarily) deserting from ''White Base''.
** In ''Anime/MobileSuitGundamSEED'', Kira and Cagalli accidentally meet the enemy commander Andrew Waltfeld and his lover/partner while scouting an enemy town for supplies. That meeting ends rather amicably: even though Waltfeld immediately realizes he is dealing with enemy aces, he likes them well enough to let them go on that occasion.
* In ''Anime/HeatGuyJ'', Daisuke is going to lay sunflowers on his father's grave, and meets up with Clair, who has just visited (and stomped on) his own father's grave. The two look at each other for several minutes, before walking past one another.
* ''Manga/JoJosBizarreAdventure'':
** ''[[Manga/JoJosBizarreAdventureDiamondIsUnbreakable Diamond is Unbreakable]]'': Josuke grabs Koichi just as he's about walk in front of a moving car, the driver being the hidden SerialKiller of Morioh, Yoshikage Kira.
** ''[[Manga/JoJosBizarreAdventureGoldenWind Golden Wind]]'': Bucciarati unknowingly ends up asking for assistance from Doppio, who is TheDragon / split-personality of Diavolo after becoming too fatigued to continue making his way to Rome's colosseum.
** ''[[Manga/JoJosBizarreAdventureStoneOcean Stone Ocean]]'': Before attempting to head towards the prison courtyard to meet with [[InstantMessengerPigeon Savage Garden]], Jolyne has a run-in with Enrico Pucci, unaware that he's the one that stole Jotaro's memories, as he only allows Jolyne passage to prevent her from finding out his identity.
** ''[[Manga/JoJosBizarreAdventureSteelBallRun Steel Ball Run]]'': Lucy Steel has a meeting with Scarlet Valentine, wife of [[PresidentEvil Funny Valentine]], using the opportunity to get close while acting as TheMole for Johnny and Gyro to steal Valentine's corpse heart.
** ''[[Manga/JoJosBizarreAdventureJoJolion JoJolion]]'': After learning the extent of Satoru Akefu's Wonder of U [[WindsOfDestinyChange ability]], Josuke, Yasuho, and Rai attempt to find a way to counteract it while running into Toru, not knowing that he's the actual user.
* In one of the ''Anime/{{K}}'' prequel novels, this is how Mikoto and Reisi first met. Mikoto, the Red King and King of destruction, is smoking in a non-smoking area, and Reisi, the newly awakened Blue King and King of order, tells him not to. They bicker about it, but don't fight.
* ''Anime/LagrangeTheFlowerOfRinne'': In the first season, when the trio of De Metrio pilots go looking for Madoka Kyono, the pilot of Vox Aura. Kirius actually runs into her wandering around town, they chat a bit, and then she runs off to do something else. As she leaves, Kirius thinks to himself, "Oh, I should have asked her where Madoka Kyono is."
* In ''Anime/MagicalGirlLyricalNanohaAs'', Team Nanoha (the heroes) accidentally meets Team Wolkenritter (the heroic antagonists) in a hospital while visiting the Wolkenritter's master Hayate (who also happens to be a friend of Nanoha's friend Suzuka; they didn't know she was their enemies' master until then, however). This takes place just before the FinalBattle, so it doesn't go well at all.
* In ''Manga/OnePiece'', the ultimate antagonist Blackbeard is first mentioned when he attacked Drum Kingdom, though he's never seen him in person until in Jaya, where Luffy and Blackbeard get into an argument over cherry pie.
* ''Franchise/{{Patlabor}}'':
** ''Anime/MobilePolicePatlaborTheEarlyDays'': In "The [=SVU's=] Longest Day pt.2", Asuma waits for Noa at a ramen noodle stall and ends up meeting Kai. It isn't until hours later, when he sees Kai's picture during a news broadcast, that he realizes he'd seen the leader of the rebel army that was currently laying siege to Tokyo.
** ''Manga/MobilePolicePatlabor''/''Anime/PatlaborTheTVSeries'': Noa and Asuma go to an arcade center on their day off and end up running into [[AffablyEvil Richard Wong]] and [[TheDragon Bado]], who would later prove to be the series main antagonists during [[WhamEpisode the Griffon arc]].
* ''Manga/TokyoRevengers'': In Chapter 5, just as young Takemichi considers the possibility of an event that could have changed Mikey, he passes by a young Kisaki. Though he doesn't recognize Kisaki, only noting that he seems familiar.
[[/folder]]

[[folder:Comic Books]]
* In ''ComicBook/UncannyXMen'' #183, Wolverine, Nightcrawler, and Colossus unwind in a bar after the events of ''ComicBook/SecretWars1984'' and see Juggernaut across the room. A fight breaks out between him and Colossus. Since Colossus has just broken Kitty Pryde's heart, Wolverine stays out of it and keeps Nightcrawler out as well.
[[/folder]]

[[folder:Fan Works]]
* In ''Fanfic/DontEvenBother'', Steven [[TheRunaway runs away]] from Beach City and the Crystal Gems by hitching a ride on a freight train. On the way, he stops by the Kindergarten, where earlier chapters revealed Peridot was staying after she tried to destroy the Crystal Gems and they ended up stranding her on Earth. As would have it, they eventually run into each other, and while they are at first adamant to each other’s presence, they both begin to draw parallels to their respective situations, and eventually decide to hide from the Crystal Gems together when they come searching for Steven. This leads them to developing a strong friendship that would serve as the main focus of the story.
* ''Fanfic/VenusFlash'' (a ''Anime/SailorMoon''/''Anime/CuteyHoney'' crossover):
** Minako and Honey's secret identity are in a jewel shop because of a discount sale at the same time [[MonsterOfTheWeek the youma Morga]] is in waiting for the right moment to kidnap and replace the owner. Then Jadeite and a platoon of low level youma barge in, as [[EvenEvilHasStandards they have just found out what the owner is up to and were disgusted by it]]. ''Then'' the owner is revealed being a member of Panther Claw...
** After a battle, Minako returns home... and [[spoiler:finds that the tentacle youma Electricus is servicing her mother]]. Wisely, the youma leaves.
[[/folder]]

[[folder:Films -- Live-Action]]
* In ''Film/Ariel1988'', Kasurinen runs into a man who robbed him earlier.
* In ''Film/BatmanReturns'', Bruce Wayne and Selina Kyle are at the same party when they realize that they are enemies (i.e., Selina figures out that Bruce is Batman, and he that she is Catwoman) while they dance together.
* In ''Film/KickAss'', after having his operations foiled, the BigBad puts a hit out on the eponymous hero. Then, as he's casually driving down the street in his limo, who should walk past but ''Kick-Ass!'' [[spoiler:Actually a subversion. It was really an unfortunate Kick-Ass imitator, whom the BigBad shoots in the head and then inspires the ''real'' Kick-Ass to retire in fear of his safety.]]
* ''Franchise/MarvelCinematicUniverse'':
** ''Film/CaptainAmericaTheFirstAvenger'': While searching for Bucky, Cap happens to spot [[MadScientist Dr. Zola]] fleeing his lab, but abandons pursuing him in favor of finding Bucky. A few minutes later, however, the two encounter Schimdt and Zola as they all head for the elevator, and Zola ends up cutting them off so that the heroes can't reach them.
** ''Film/GuardiansOfTheGalaxyVol3'': While the Guardians are infiltrating Orgo Corp to find the file with the passcode to Rocket's kill switch, Quill incidentally bumps shoulders with Recorder Theel, who has just removed the passcode from the file to take to the High Evolutionary. Quill recognizes Theel later when Nebula is analyzing the file and the record of who previously accessed it.
* ''Film/PulpFiction'': A boxer named Butch, on the run for ''not'' throwing a fight for Marcellus Wallace (a local crime boss), shows up at his apartment to retrieve his gold watch. He decides to have a quick snack... and notices a submachine gun lying on the counter and picks it up to examine it. Cue toilet flush, and Vince Vega (who works as muscle for Wallace) walks into the kitchen, finding Butch with his gun. Then, Butch is driving back to the hotel he and his girlfriend are hiding out. He stops at a light, and who should cross the street at that exact moment but Marcellus Wallace, the man who put the hit out on him, who was out getting coffee.
* In ''Film/SupermanReturns'', Lois sneaks onto Lex's yacht (not knowing it's his) and runs into the man himself, while he is brushing his teeth and utterly surprised to see her there.
* In ''Film/TheTown'', the {{Villain Protagonist}}s have just pulled off a daring robbery and managed to escape pursuit... only to run smack into a police officer while they switch cars. [[spoiler:The officer chooses to pretend he didn't see them]].
[[/folder]]

[[folder:Literature]]
* A frequent occurrence in ''Literature/TheAffix'', because the Affix is a probability warper and it's drawn a lot of antagonists into one city at the same time, each with different reasons for trying to acquire it. Later in the series, this still happens a lot, for similar reasons.
* ''Literature/TheBeginningAfterTheEnd'': Arthur first meets Lucas and [[spoiler:Elijah]] at the same time when he goes to get examined for his adventurer's license, as they are also present to get theirs. Two years later, he comes across them both by chance when he and Jasmine join up with the party bound for the Dire Tombs, as they have also joined up with the party. Little would he know at the time that both of them would go on to become some of his most bitter enemies.
** {{Downplayed}} between Arthur and Lucas. In the fallout from the incident in Dire Tombs, Lucas had been let off the hook for his actions thanks to his family's influence, and so Arthur knew to expect seeing him at some point when he began attending Xyrus Academy. When they do cross paths, it is by chance during one of Arthur's upper-level classes much to his dismay. However, even though Lucas does not recognize Arthur as he had taken extensive precautions against him, he still ends up antagonizing him as he believes Arthur stole his spot on the Disciplinary Committee.
** As for [[spoiler:Elijah, he is in fact an amnesiac Nico Sever, Arthur's former best friend from his past life as King Grey who had been reincarnated by Agrona and become a willing servant of his out of a misplaced desire to exact revenge on his former friend. Nico had been given amnesia regarding his past life and sent off to Agrona's servants in Dicathen so that he would eventually locate the reincarnated Grey, who had reincarnated outside of Agrona's control and was essential to his overall plan]].
%%* Happens all the time with [[BigBad Monsieur Thenardier]] and InspectorJavert in ''Literature/LesMiserables''.
* ''Literature/ASongOfIceAndFire'':
** In ''Literature/AGameOfThrones'', two characters ([[spoiler:Catelyn Stark and Tyrion]]) travelling in opposite directions, going about their own business, recognise each other in an inn, causing the intrigues of other characters to spiral out of control into an all-out civil war.
** In ''Literature/ADanceWithDragons'', [[spoiler:Tyrion]] is on the lam and has travelled to an entirely different continent, where he convinces his travel buddies to let him stop off at a brothel. While there, he happens to bump into Jorah Mormont, the dismissed-but-still-loyal knight of Daenerys's court, who are enemies to the Lannisters. Jorah was only there for the same reason as [[spoiler:Tyrion]] himself: he was going through depression and needed a quick lay.
* In ''Literature/SoonIWillBeInvincible'', Dr. Impossible is having a cup of coffee and reading the paper when several members of the New Champions run across him and a battle ensues.
[[/folder]]

[[folder:Live-Action TV]]
* ''Series/The100'': When Clarke checks out the forbidden areas of Mount Weather, she discovers Anya, last seen trying to kill Clarke and all her friends, locked up in a cage.
* ''Series/BreakingBad'': Walt happens to meet Jane's father Donald Margolis [[spoiler:the night she dies]]. He later talks with Jesse about the "astronomical" odds of the meeting after he realizes what happened.
* In ''Series/BurnNotice'', Michael is infiltrating a bomb-maker's apartment. The bomb-maker had rigged a booby-trap to the door: a claymore, pointing at the door, tied to a rope. If the door opens, the rope slackens, which will set off the claymore. Michael, luckily, notices the trap and pulls on the rope to keep it taut. At that exact moment, though, the bomb-maker happens to walk in the back door. Though surprised, he quickly takes advantage of the situation, since Michael is standing directly in the path of the claymore and can't let go of the rope.
* The ''Series/{{Firefly}}'' episode "[[Recap/FireflyE11Trash Trash]]" has Mal run into [[TheVamp Saffron]] his ex-wife, who tried to get him and his crew killed on some backwater moon. As soon as they see each other they draw guns on each other.
* ''Series/GameOfThrones'':
** While going about their own business, Catelyn Stark and Tyrion Lannister recognize each other at an inn, causing the intrigues of other characters to spiral out of control into an all-out civil war.
** In "[[Recap/GameOfThronesS4E10TheChildren The Children]]", the two character duos wandering the Riverlands and the Mountains of the Moon bump into one another by chance.
* ''Series/{{Hannibal}}'': During season 3's "Red Dragon" arc, the first significant divergence from the novel's plot happens when [[spoiler:the killer Francis Dolarhyde, who has conned his way into the Brooklyn Museum to destroy the William Blake painting, is interrupted by Will Graham, the man in charge of catching him, who was tipped off to the painting's importance by Hannibal]].
* ''Series/TheLordOfTheRingsTheRingsOfPower'': Galadriel spends several thousand years looking for Sauron, and [[spoiler:she happens upon him by chance, in the middle of the ocean, in his fair form]].
* ''Franchise/MarvelCinematicUniverse'':
** ''Series/Daredevil2015'':
*** In "[[Recap/Daredevil2015S1E9SpeakOfTheDevil Speak of the Devil]]", Matt Murdock visits the art gallery run by Wilson Fisk's girlfriend Vanessa Marianna, hoping to tease some information out of Vanessa. While Matt is talking with her, Fisk shows up and Matt has to make some awkward small talk with him about the tenancy dispute Fisk is having with one of Nelson & Murdock's clients to avoid blowing his cover.
*** In "[[Recap/Daredevil2015S3E3NoGoodDeed No Good Deed]]", Matt first encounters Benjamin "Dex" Poindexter while he's trying to infiltrate the hotel where Fisk is on house arrest. He gets stopped by Dex (who is screening those coming to and from the elevator) while trying to follow Fisk's lawyer Ben Donovan to the parking garage. [[Recap/Daredevil2015S3E6TheDevilYouKnow Three episodes later]], they have their first fight, with Matt fighting Dex as he's in the midst of carrying out an attack on the ''New York Bulletin'' on Fisk's orders.
** ''Series/LukeCage2016'': In "[[Recap/LukeCage2016S2E5AllSouledOut All Souled Out]]", Luke is being forced to headline at a party being thrown by Piranha Jones to raise money to repay Cockroach, who is suing him for assault. By chance, Shades is also at the party because he doesn't trust Piranha to keep his mouth shut about a shady stock deal he just helped Mariah make. This results in a hilariously awkward moment when they cross paths at the party.
--->'''Hernan "Shades" Alvarez:''' [[DeadpanSnarker You do parties now? 'Cause my cousin's quinceañera is next week.]]
[[/folder]]

[[folder:Tabletop Games]]
* ''TabletopGame/MutantChronicles'': One ''War Zone'' battle scenario works like this, pitting two scout teams (the [[AmazonBrigade Bauhaus]] and [[HighlyVisibleNinja Mishima]]) against each other. The scenario starts with the sergeants of both sides already dead; both scout teams have been crawling through tall grass and somehow FailedASpotCheck until the leaders nearly bumped into each other.
* In Fate system games like ''TabletopGame/SpiritOfTheCentury'', if you take an Aspect representing a nemesis, you are begging your GM for this to happen. But at least you get bonus fate points out of it. Other games with Nemesis disadvantages (or advantages) also ask for this, though the degree to which such nemeses are part of the rules versus "just" a story hook varies depending on system.
[[/folder]]

[[folder:Video Games]]
* ''VideoGame/ANNOMutationem'': While Ann is on her way to [[ShipLevel the Walter Raleigh]], K, a passenger on the boat and actually a member of The Consortium, decides to tell her [[LetMeTellYouAStory a story]] about a past incident. Later, Ann notices that he somehow vanished off the boat before she could ask more questions.
* ''VideoGame/DevilSummoner'': This is how the protagonist and Sid first meet in Hirasaki City, until the latter bluntly tells the former that he'll kill him for not having the book with him.
* In one sidequest in ''VideoGame/FinalFantasyVII'', Cloud and the gang pursue Yuffie to Wutai after she steals all of their Materia, where they find several members of the Turks hanging out in a bar. Fortunately, [[PunchClockVillain the Turks]] are currently on leave and aren't interested in pursuing their conflict with Cloud.
* ''VideoGame/LastScenario'' has a scene where Hilbert returns to his hometown to fend off invading bandits and finds that [[DragonWithAnAgenda Castor]] had also come to put down the bandits. Castor tells Hilbert [[NotSoDifferentRemark that they're not so different]], and leaves because he realizes fighting at that point would be pointless.
* ''VideoGame/MegaManBattleNetwork2'': Before boarding the airplane back home, Lan encounters a boy who gives him a silent DeathGlare. [[spoiler:In the final fight, Lord Gospel is [[TheManBehindTheCurtain revealed]] to be the same boy, Sean Obihiro.]]
* In ''VideoGame/MedalOfHonorFrontline'', Agent Patterson gets a sneak peek at the BigBad Sturmgeist during an infiltration mission of a German seaport while the latter is inspecting said seaport. Sturmgeist becomes Patterson's target of pursuit in the later campaigns. Said early encounter occurs during the mission named "A Chance Meeting".
* In ''VideoGame/TalesOfTheAbyss'', there is a scene where the protagonists are going to visit a scholar who have knowledge pertinent to their quest. When they arrive, the BigBad is already there, reading up about the same subject. The two of them have a bit of a row, but out of respect for the scholar (an old friend of his), the Big Bad leaves without anything coming of it.
[[/folder]]

[[folder:Webcomics]]
* In ''Webcomic/WeakHero'', protagonist Gray's first meeting with BigBad Donald, all the way in Episode 163, is pure coincidence, as he leaves a hospital (where he was looking for volunteer work) at the same time as Donald enters (for unnamed medical reasons). Gray is fully aware of who Donald is and feels his heart thumping as they pass, whereas Donald doesn't seem aware of Gray and silently goes his way.
[[/folder]]

[[folder:Western Animation]]
* ''WesternAnimation/MyAdventuresWithSuperman'': In "[[Recap/MyAdventuresWithSupermanS1E09HeartsOfTheFathers Hearts of the Father]]", [[Characters/MyAdventuresWithSupermanSuperman Clark Kent]] has a shocking reaction to seeing Lois' father and realizing that he's The General that's been trying to kill him, the latter having no idea that Clark Kent is also Superman.
* ''WesternAnimation/VoltronLegendaryDefender'': Lotor's Generals and the Voltron Paladins happen to meet at a post under siege.
[[/folder]]
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