- They do know each other but for some reason don't remember. Maybe the other character is a Forgotten Childhood Friend or Long-Lost Relative. Maybe they've been subject to Laser-Guided Amnesia and it missed a spot. Or maybe Alice just has a bad memory.
- They do know each other, but Alice doesn't recognize Bob (for example, he is in disguise or has transitioned).
- They do know each other, but are pretending not to. Perhaps Bob is deliberately ignoring Alice, or Alice is just teasing.
- They don't know each other, but Bob reminds Alice of someone. Maybe he's an Identical Stranger, or has Uncanny Family Resemblance to a relative of his that Alice actually knows. Might lead into You Remind Me of X.
- Time travel, reincarnation, or dimensional shenanigans. Alice has met Bob somewhere else in spacetime, but not in this particular time/dimension/life (or not yet). But because of that, she thinks he's familiar anyway. Compare Flash Sideways.
- Metafictional humor. Alice or Bob is making an Actor Allusion, or are part of a Casting Gag where they played characters who had a relationship in a different show, or they are Relationship Voice Actors, or they are Those Two Actors, and the writers wanted to point that out.
Super-Trope to Have We Met Yet?, where they have met...sometime in the future, and the time-traveler is just getting caught up to speed; compare Time-Travel Tense Trouble. If Bob is not trying to tip the others off to their association, he might respond with a We Do Not Know Each Other-type of phrase.
- At the end of Rurouni Kenshin, Enishi and his father, whom we only know as "oibore", run into each other in the hobo camp and have the vaguest feeling that they may know each other, but neither thinks anything of it (or the latter just decided to not reveal himself).
- In a chapter of Ranma ½, Akane gets brainwashed (literally, with shampoo on the scalp) to forget Ranma. She says this to Ranma multiple times in the chapter, but also once to her dad as a joke.
- In the first episode of Martian Successor Nadesico Yurika runs into Akito and asks if she's met him before. Akito says that they've never met, not realizing until Yurika has let on that she's the girl he was friends with as a child.
- Haruhi Suzumiya asks Kyon this during their first conversation. She has in fact met him before, but Kyon hasn't; he will meet her three years ago a couple of months later.
- It happens on one of the last episodes of "Hamatora", between the big bad and the guy who owns the bar where the heroes work.
- Played for Laughs in a Sailor Moon webcomic, where Usagi thinks that she hears her mom, only to find it coming from Michiru. In the original dub, Barbara Radecki voiced both.
- At the end of Serial Experiments Lain, Lain ascends into the Wired, erasing her from existence. The only people who cared about her—her father and Alice—are the only ones that feel that something is off, but shrug it off. In the epilogue, an adult Alice is taking a nightly stroll through the city when she notices that an awfully familiar girl is watching her. Alice, being a teacher, asks if they've met before, possibly if she was one of her students in the past. Lain, smiling, says no, they've never met, and the two bid farewell. The series closes with Lain saying goodbye to the viewers and that she'll always be with them.
- Transformers Energon had a joke in the Japanese version where Cliffjumper constantly points out that he sounds like Optimus Prime. Since the dub used two different actors, the joke was removed.
- At the end of Your Name, because a Plot Twist is that Taki's body is three years later in the future than Mitsuha's body, the events taking place after Mitsuha and her village are killed by the comet are altered when they evacuate the village in time. Taki and Mitsuha also completely forget about the whole bodyswapping ordeal and everything related due to this, but then they cross paths in Tokyo, with the movie ending with the two asking if they know each other.
- Animal Man: The titular hero and Rip Hunter apparently meet for the first time in issue #22. Their Pre-Crisis team-ups appear to be no longer canon, but they wonder if they ever met before.
- In the Supergirl's Peter David, Linda Danvers is introduced to Dick Malverne, and both teens stare transfixed at each other until Dick finally asks if they have met before, a nod to the original Linda and Dick being lovers in Pre-Crisis continuity.
- In "The Nix in the Mill-Pond", the vengeful nixie sends a flood to separate the husband and wife and they wash ashore in different countries. When by chance they find each other again years later, they don't recognize each other at first.
- In "Maid Maleen", the heroine and her prince meet again after seven years of separation, but they don't recognize each other until the prince mentions she greatly resembles his former lover.
- Fate/Starry Night: After tearing through a swarm of bladed wing worms trying to break into a house, Jack sees a young girl sleeping soundly in bed that feels like Ritsuka. By killing the bugs, Jack gets the feeling that she's saved her Mommy, but she doesn't understand why, implying that the little girl is the female version of him. She also gets the feeling that the mud girls that have been popping up around the city are her Mommy, giving her the urge to eviscerate them.
- In Heroic Myth, Loki and Freya can't shake the feeling that they ought to know Saber and Lancer, despite being sure that they've never met in their lives, a nod to their shared origins in Norse Mythology.
- In Imaginary Seas, Percy has already met all of the Olympian gods in his own lifetime and treats them all like old acquaintances. By contrast, none of the gods had ever heard of him because he didn't exist in their history. Athena in particular, or rather her terminal Minerva, is baffled when Percy calls her his mother-in-law.
- In Pokémon Reset Bloodlines, Arceus grants Ash the ability to restore the memories of his friends and Pokémon before being sent back in time. However, it only works to its full on his Pokémon, and with his human friends it only works partially or might not even work at all. As a result, when Misty and Iris make physical contact with him, they gain a strange sense of familiarity, but they don't understand why, since he's unable to restore their memories proper.
- The Volatileverse has Jason Todd starting unaware he was dimensionally displaced when he catches a glimpse of Batman and Robin, so the vigilante really wonders why the new Boy Wonder feels familiar. The world-hopping comes to light with the reveal that Robin is actually his predecessor Dick Grayson, here thirteen years old.
- Live a Hero (MHA); Izuku wonders this of Tenya Iida when they first meet after they get accepted into U.A. This is because Tenya's older brother, Tensei, was the Pro-Hero that rescued Izuku when he escaped from the League of Villains six years prior
- At the end of Jonah: A VeggieTales Movie, Khalil shows up as a tow-truck driver. Twippo, who had just finished his song, reacts by asking him "Uhh...have we met?", causing Khalil to stare back at him as we cut to the credits.
- Madagascar: Escape 2 Africa, After seeing Zuba, his dad, for the first time since he was a cub, Alex, who couldn't remember him because he spent most of his life in New York, said this to Zuba:
Alex the Lion: You look familiar, Do I know you?
- Tarzan: Clayton says it after hearing Tarzan say his name, which he learned from Jane. Later, he uses it more sarcastically when Tarzan is captured by his minions.
- Duck Soup
Ambassador Trentino: Have we met each other before, sir?
Rufus T. Firefly: I don't think so. In fact, I'm not sure I'm seeing you now; it must be something I ate.
- Get Shorty
Harry Zimm: Have we met? I don't recall.
Chili Palmer: We just did. I told you, my name is Chili Palmer.
- Multiplicity. Doug Kinney has been suffering from Cloning Blues.
Woman in Restaurant: Have we met?
Doug Kinney: No.
- Pirates of the Caribbean: The Curse of the Black Pearl: This is Jack's reaction to seeing Will. They haven't met before, but he knew Will's father.
Captain Jack Sparrow: You seem somewhat familiar, have I threatened you before?
- Dr. Horrible's Sing-Along Blog
Cpt. Hammer: You look horribly familiar.
- Déjà Vu (2006) when Claire, who just witnessed her rescuer, Doug, get killed in an explosion, sees his present-day self (as opposed to the one who traveled back in time and was killed) appear. He then asks her this question when she is on the verge of tears at seeing him. Doug seems to regain his future self's memories of Claire at the end of the movie.
- She's the Man: Duke runs into Viola out of her disguise as Sebastian
Duke: Do I know you?Viola (in a high pitched girl voice) No!
- Angel Heart: When Harold Angel visits his new client Mr. Cyphre, the latter notes that Angel somehow looks familiar, but Angel doesn't think they've met before. It turns out that Cyphre is actually Satan. He has a contract on Angel's soul, and was just messing with the amnesiac Angel.
- Die Another Day - When James Bond and Gustav Graves are introduced, Graves looks at him funny and asks if they've met before. Bond says he'd remember. "Graves" is actually a villain from earlier in the movie given plastic surgery, enjoying his ability to hide under Bond's nose.
- The Chronicles of Riddick: When the Lord Marshal meets Riddick and gives him the knife belonging to the warrior that Riddick has just slain, he wonders if they've met before. Subsequent interrogation confirms Riddick to be one of the last survivors of a race that the Lord Marshal had wiped out years before as a young warrior. The extended version of the film makes this literal: the Lord Marshal is the one who attempted to kill Riddick as a newborn infant by strangling him with his own umbilical cord.
- Rōnin: Lampshaded when the pack of hired mercenaries are assembled for their first job briefing, and Spence (Sean Bean), meets the older and obviously more experienced operator Sam (Robert De Niro), and asks "Do I know you?" Sam replies dryly: "I don't think so. I'd remember." This seemingly throwaway character line later gains a lot more meaning when we find out that Spence is a poseur who doesn't belong with the rest of the team, and Sam is the one to out him and humiliate him, de facto placing himself in charge of the operation. The question and the answer both ascend to the status of Arc Words by the end of the film, as numerous variations occur throughout. The trope is also played straight later in another classic character moment for Gene Reno's Vincent:
Thug: How do I know you?Vincent:(hard stare) Vienna.
Old Friend: I'm sorry, do you know me? How do you know I speak English?"Sam: You're carrying an English newspaper...
- Again a slight variation is employed again with Sam calling out to a "friend from highschool" fellow CIA operative and former or even current colleague" on the street, asking for directions:
Sam: Whenever there is any doubt, there is no doubt. That's the first thing they teach you.Vincent (quizzically): Who taught you?Sam: I don't remember. That's the second thing they teach you.
- The film gives us the tiniest shred of doubt that Sam doesn't know Spence from the beginning, when Sam has this early exchange with his French counterpart Vincent, who suspects Sam's status as a CIA operative.:
- Alias episode "Succession"
Ushek San'ko: Chateau Patreuse, 1982...your favorite, no?
Julian Sark: [surprised] Have we met?
- Angel: Defied Trope In "Blood Money", neither Angel nor Anne recognize one another, despite having met briefly three years earlier. For Angel, who spent centuries in a Hell dimension inbetween, it's been even longer than that. Writer Mere Smith explains: "Joss was like, 'Do you remember everybody you met three years ago, and shared three sentences with?' And I was like, 'Oh, fine, use logic.'"
- Arrested Development episode "Forget Me Now"
Larry: Interfere? I ought to pull down your pants and spank your ass raw.
Michael: I'm sorry, have we met?
- Buffy the Vampire Slayer "Becoming: Part 2"
Joyce: Have we met?
Spike: Uh, you hit me with an axe one time. Remember "Get the hell away from my daughter"?
- Charlie's Angels episode "To See an Angel Die"
- During the Arrowverse crossover Crisis on Earth-X, Barry asks this of a waitress who seems a little too thrilled to be at his and Iris' wedding. The waitress - heavily implied to be their Kid from the Future - has a look of brief panic before insisting that she's a complete and total stranger.
- In the finale of Kamen Rider Build, Sento wakes up in a merger between his universe and one without Evolto, where none of the series's events ever happened, and looks around for his friends. None of them remember him, but Misora seems to recognize him and asks this. Unfortunately, Misora just recognizes him as Taro Satou, the guy whose face was given to Sento in the original universe.
- Staged: Michael Sheen has worked with Samuel L. Jackson before, but he had a bag on his head at the time.
- Star Trek: Deep Space Nine episode "Emissary"
Commander Benjamin Sisko: It's been a long time, Captain.
Captain Jean-Luc Picard: Have we met before?
Commander Sisko: Yes, sir. We met in battle. I was on the Saratoga at Wolf 359note .
- The Six Million Dollar Man "The Bionic Woman: Part 2"
Joseph Ronaugh: Colonel Steven Austin. I can't tell you what a pleasure it is to see you face to face again.
Col. Steve Austin: Have we met before?
- Subverted famously in Seinfeld, such as in this example:
George, into the phone: Jerry! Jerry, you gotta help me!
Jerry: (Pauses, smiling) Who is this?
- Misfits S1E4, after Curtis rewound time so that he never got his ASBO. Happens repeatedly, even! With the same character, too!
Curtis: Oy, Nathan, I need your help!
Nathan: ...Do I know you? [glances at Curtis, who is kneeling] Are you taking a shit? There's a guy over here taking a shit!
Curtis: I'm not taking a shit!
Nathan: How do I know you again?
Curtis: [later, after rewinding time again] It's you!
- And then again:
Nathan: What? Do I know you?
- Merlin: Arthur says this after meeting Merlin in old man disguise for the first time, and Merlin has to knock him out before possibly getting his cover blown.
- In the final minutes of the series finale of the Soap Opera The City (a reworking of Loving), Jocelyn returns a call from Sydney Chase, only to reach her secretary, who tells her that she's not available. Jocelyn asks "Have we spoken before?", which the woman denies, but after she hangs up, we see that they have—it's local psychopath Molly Malone, who escaped from prison and killed Sydney before she could warn everyone.
- One especially lovely Mel Tormé song, about setting up a meeting with an old flame, is called Haven't We Met?
- Dice Funk: Rinaldo asks the mysterious AC if they've met before, since they share an unusual accent.
- A couple times in Sweeney Todd: The Demon Barber of Fleet Street the Beggar Woman asks Sweeney Todd if she knows him. It turns out she does because shes Lucy, Sweeney Todds allegedly dead wife. When Sweeney Todd gets a better look at her dead face, hes filled with horror that he killed his own wife.
- Final Fantasy IX
Lani: I've been looking for you, Princess Garnet.
Zidane: Have we met?
Garnet: Quit flirting with her!
- An almost Tear Jerker example in Kingdom Hearts II when Sora meets the real versions of the kids that were Roxas' friends in the Twilight Town simulation.
- In The Elder Scrolls IV: Oblivion, in the town Chorrol some people make remarks about how they met one of the inhabitants in a totally different town, and he acted as if he had never met them. When you investigate this, it turns out the person in question proves to be the long lost, assumed dead, other half of an identical twin.
- In Super Robot Wars: Original Generation, Masaki asks Gilliam if they know each other. Gilliam assures them that they don't, although he knows the Masakis from the Hero Senki and Classic Super Robot Wars timelines.
- In the adult timeline of The Legend of Zelda: Ocarina of Time, Link can visit Lon Lon Ranch and ride the horses. When Link first talks to Ingo, he will ask Link if he knows him. Its never stated if he remembers Link is the boy who visited the ranch seven years ago. Malon, on the other hand, will remember Link and be excited to meet him again.
- In The Legend of Zelda: Majora's Mask, Anju is supposed to be getting married to Kafei the day after the 3rd day, but the Skull Kid turned Kafei into a child. If you do everything necessary to get the good ending to their sidequest, Kafei meets with her, still appearing as a child. Anju remembers having met him before.
- Undertale: In the True Pacifist Run, Toriel and Sans find each others' voices familiar and realize that they'd been acquainted for quite some time.
- This exchange from Mortal Kombat 11:
- Two examples in Daughter for Dessert:
- The protagonist thinks Cecilia looks familiar when she first shows up at the diner.
- The protagonist thinks Saul looks familiar when they first meet. This is a subversion, because although he thinks Saul might be related to Lainies family lawyer, its never stated for sure.
- Double Homework:
- The protagonist initially thinks Amy looks familiar. Eventually, Amy is revealed to be a princess.
- Averted with the protagonist and Dennis. The protagonist initially has no recollection of Dennis at all, and Dennis knows exactly where he met the protagonist. Eventually, the protagonist realizes that they met briefly after his breakup with Rachel.
- In Misfile, during the wedding, Heather says this to Ash after (s)he introduces her to his/her friends. Heather dismisses not remembering Ash as unimportant, but a Flashback on Heather's part reveals her question is a matter of jealousy.
- In The Inexplicable Adventures of Bob!, Galatea is confused when Riboflavin mistakes her for Molly.
- Bob and George generally keeps track of who met who, especially regarding the titular Bob. Bob spends most of the strip in different alternate dimensions, so even though he's a major villain, only a few characters know who he is for a good chunk of the strip. Bob, however, knows who they are because he watched his brother play Mega Man, which leads to a moment where he barges into Dr. Wily's lair and makes demands for several strips, before Dr. Wily interrupts to ask who he is. To be fair to Bob, they did interact once, and to be fair to Dr. Wily, it was several years ago from his point of view.
- In Hazbin Hotel, Alastor has this response to Sir Pentious, though he may have been doing so to deliberately mess with him.
- American Dad!! episode "Finances with Wolves"
Francine Smith: You know, you seem very familiar. Have we met before?
Klaus: Oh, you know, I'm just one of those black Germans that seems familiar to everyone, hmm?
- Avatar: The Last Airbender Suki is out of her uniform and full face makeup, and Sokka doesn't recognize her. She decides to play this up for a good laugh.
Sokka: Is there a problem?
Female Security Guard: Yeah, I got a problem with you. I've seen your type before. Probably sarcastic, think you're hilarious. And let me guess, you're traveling with the Avatar.
Sokka: Do I know you?
Guard: You mean you don't remember? Maybe you remember this. (kisses him)
- Subverted in a later episode when Sokka attempts a similar stunt while disguised as a helmeted Fire Nation prison guard, and Suki clocks him one before she recognizes him.
- In one episode of Gargoyles, Owen Burnett is asked this question by another, identical-but-for-hair-color majordomo named Preston Vogel, and Owen replies, "I assure you, we have not." This is not a case of Only Six Faces, though, since Puck deliberately chose the man as his inspiration for his Owen alter ego.
- Spider-Man Unlimited
Lester: Have we met?
Spider-Man: Sorta, but the Electro I know looks like a movie star.
- The Batman episode "Call of the Cobblepot"
The Penguin: Bruce Wayne! King of the castle, ruler of the roost.
Bruce Wayne: Have we met?
The Penguin: Cobblepot. Oswald Cobblepot.
- Before this, Harley Quinn stumbled across Bruce Wayne while shopping in the Batman: The Animated Series episode "Harley's Holiday".
Harley: Hey, don't I know you?
Bruce: I don't think so.
Harley: Something about that chin... I know! You're Bruce Wayne, the boy billionaire! Hmm, unattached, I see...
Joker: Say, don't I know you? Sure, Bruce Wayne! Ah, so this is how your family made all those billions!
- In "Joker's Wild," the Joker sneaks into a casino named after him as a blackjack dealer (as all the game proprietors are dressed in Joker attire). Bruce Wayne approaches his table.
Bruce: (tongue-in-cheek) The secret's out!
- Rocky and Bullwinkle: Rocky usually asks "Haven't we met before?" when he and Bullwinkle come across Boris Badenov in one of his disguises and pseudonyms.
- The Venture Bros. has Brock ask 21 "Do I know you?" when the latter challenges him to a fight in the first season. Averted in that they didn't actually know each other, but then this exchange is repeated in the fourth season...
21: Brock Sampson...At last we meet.
Brock: Do I know you?
21: Oh, don't pull that shit with me! I have been waiting for this moment for a year!
- Looney Tunes: In "A Gruesome Twosome," two cats go after Tweety to impress a girl. Neither one knows that each other is going after the same bird, so when they reach Tweety's nest and set eyes on him:
Tweety: Have you two putty tats met? (They see each other and start hissing)
- He-Man and the Masters of the Universe (1983): In "Quest for He-Man", Orko alongside Ram-Man and Cringer went looking for He-Man when he had his memory erased and got sent to a different dimension by Skeletor. After finding him:
Orko: He-Man! Can't you remember anything.
He-Man: Do I know you?