- An Uncanny Family Resemblance to someone Alice or Bob knows.
- Alice and Bob are long lost relations of some sort.
- Alice or Bob is an Identical Stranger to someone.
- 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.
- Alice or Bob knew each other in a past life.
- Alice or Bob is actually Christie or Charlie in a Paper-Thin Disguise.
- Alice or Bob is a Forgotten Childhood Friend.
- Alice or Bob is suffering from Cloning Blues.
- Alice or Bob simply has a bad memory, or more dramatically, is suffering from some kind of memory-related ailment.
- Alice or Bob do know each other, but one or the other is teasing.
- Alternately, neither Alice nor Bob actually know each other; one of them is just being a flirt.
- Alice or Bob is Literal-Minded or a Cloudcuckoolander and misconstrued an otherwise innocuous statement. (See also Sarcasm Failure.)
- Alice or Bob is playing with the Timey-Wimey Ball and suffering from a bit of Time-Travel Tense Trouble, resulting in Have We Met Yet?.
- Alice or Bob has gone dimension-hopping and met Earth-1 Alice/Bob.
- Alice is actually Alex (or Bob is actually Barbara).
- Alice and Bob do know each other, and one of them is asking the other "What are you doing here?" in a way that does not tip off the others to their association.
- Alice and Bob do know each other, but the one asking the question is giving the other the cold shoulder.
- Perhaps she considers him (or vice versa) an unwelcome Abhorrent Admirer.
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Anime and Manga
- 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 oibore 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 left 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.
- 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.
- 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.
- 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.
- 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 he knew Will's father.
Captain Jack Sparrow: You look somewhat familiar, have I threatened you before?
- Dr. Horrible's Sing-Along Blog
Cpt. Hammer: You look horribly familiar.
- Déjà Vu 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.
Live Action TV
- 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.
- 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.
- 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.
- 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 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.
- 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.
- 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: Don't I know you? Oh, yes. Bruce Wayne, the millionaire. So this is how you made your fortune!
- 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) 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)