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- InuYasha: 'My name is NOT Kikyo. It's Kagome. KAH. GOH. MAY.' (Kikyo is Inu-Yasha's ex-girlfriend, Kagome being her reincarnation.)
- In Fruits Basket, Tohru's grandfather calls her Kyouko. Kyouko was the name of Tohru's (dead) mother. He is aware of who she is, he just (in his words) "wants to tie them together", as everyone in his life ultimately ends up leaving him.
- In an early episode of Pokémon, a random woman mistakes Ash for her missing son and calls him "Arnold."
- In Star Blazers, Queen Starsha initially mistakes Nova for her own sister Astra, who died in the first episode. (She's not the only one to notice the resemblance, which is very strong, but unexplained.)
- In Blazer Drive, this happens to the protagonist when an ill mom mistakes him for her dead son. The protagonist, being an orphan who recently lost his older brother, goes along with it. just before she dies, the mom reveals that she knew he wasn't her son, but because it made the both of them so happy she didn't want the "reunion" to end.
- Global Garden is an interesting case in that the girl had latent magical powers that were turning her into a boy to grant her mother's wish without the girl be aware tha she was doing it.
- Something similar to this happened in Secret Plot Deep, where the main male character's twin sister died in an accident, and his parents were so shaken up about it that they started believing he was his sister. Apparently, they got rid of all the photos of him and forgot he existed. To keep them content, he cross-dressed when at home. This leads to transvestite sex with a girl from school. And a female teacher.
- In Kongou Banchou, Machine Banchou mistakes little Tsukimi for "Dr. Tsukina", whose orders supersede all others, and she unintentionally alters his personality by giving him suggestions on how to be cooler. This is played for Nightmare Fuel when she realizes the one thing she can't make him do is not kill Kongou.
- In Hayate the Combat Butler, Isumi's mother (Hatsuho) and grandmother (Kokonoe) think they're going to meet the Sanzenin's new butler (Hayate). Kokonoe sees Hatsuho and immediately thinks that Hatsuho is their butler who just happens to look like her daughter. She then realizes who it is and both wonder where the butler went.
- Hayate was actually visiting, he was standing off to the side during the conversation.
- In the Dragon Ball Z special "Episode of Bardock", Bardock mistakes Chilled for Frieza.
- Berserk has Serpico's mother succumb to dementia. Their final encounter is when she no longer recognises him, believing him to be his father, and has been accused of heresy and witchcraft and Serpico must burn her at the stake
- Played for Drama in Tokyo Magnitude 8.0 where an older woman mistakes Mirai and Yuuki for her two grandchildren who died in an earthquake the previous day.
- Ryousuke's mother in Bokura no Hentai underwent a Sanity Slippage after her daughters death. He pretends to be Yui to soothe her. Ryousuke's status as The Unfavorite combined with her deteriorating mental health causes his mother to mistake him for someone else occasionally. Right before his mother is sent for mental health treatment Ryousuke calls out to her dressed as Yui however due to his voice changing he doesn't recognize him at all. This trope is later subverted with the reveal that she knew it was him the entire time, though she did have genuine mental health issues as well.
- The League of Extraordinary Gentlemen has what appears to be an explicit tribute to Only Fools and Horses by not only using this trope, but also reusing the name "Dave".
- The Queen of Fables, an evil sorceress from a story book believes that Wonder Woman is her arch enemy, Snow White. No matter what evidence is presented to her, she refuses to believe otherwise, and seems completely unaware of the passage of time, as the real Snow White would have died of old age by now. She also mistakes Superman for Prince Charming.
- Effie in the Ernie/Piranha Club newspaper comic regularly mistakes people for one of her many ex-husbands. (Except Arnold, which she thinks is one of her old dogs.)
- Enrico the Mole, from the Italian comic strip Lupo Alberto, has addressed the eponymous protagonist as "Beppe" ever since his first appearance. As years went by, Alberto went from his initial bemusement to desperate frustration and eventually to wry resignation. The real "Beppe" (supposedly a friend of Enrico's) has never actually appeared in the strip.
- At one point in Suicide Squad, a mentally-unstable Deadshot starts seeing his boss Amanda Waller, his team leader Rick Flag, and a senator Flag wants dead as his mother, his brother, and his father respectively. He relives his worst memory through them and gets it "right" this time...which involves shooting his "father" before his "brother" can do it himself. Deadshot's family history is pretty screwed up.
- In Turnabout Storm it happens to Phoenix twice while in Equestria. First he confuses Sonata with his deceased mentor Mia, something that happens because both have the same voice, and since Sonata looks exactly like Mia would look in pony form. Later on, and more amusingly, he confuses Applejack with Lotta Hart because of the accent, making him completely freak out.
- In No Hoper when Neferet assumes Light has been possessed by Kalona, her lover and the Big Bad. Light has no clue what's going on but for the sake of self-preservation plays along with it. When the scary vampire lady asks you if you're a God, you say yes.
- Several Harry Potter fics have Luna, her father or both firmly convinced that Sirius is "really" Stubby Boardman of the Hobgoblins. In In This World and the Next he admitted having used his resemblance to the latter to pick up women.
- In the western Quigley Down Under, Crazy Cora keeps calling Matthew Quigley 'Roy'. (Roy turns out to be Crazy Cora's first husband, who left her after she accidently killed their child.) Which is what made it so significant when she called him by his full name in the final moments of the film.
- In *batteries not included, the elderly and possibly senile Faye persists in addressing one of the other characters by the name of her (dead) son.
- And in a heartbreaking scene in the end, when said character decides to play along for once and pretends that he is her son, (because he set the house on fire, and is trying to save her) it causes her to break through her denial and realize the horrible truth...
- In the final scene of Smoke, Augie poses as a blind old lady's grandson rather than let her spend Christmas alone. Subverted in that she probably realizes that he isn't actually her grandson but goes along with the act rather than admit that she has been abandoned.
- In Mars Attacks!, senile old Grandma Norris calls both of her grandsons "Thomas". Strangely enough, she does remember their names in some capacity, as she tells Ritchie that "Ritchie" was always her favorite... while still calling him Thomas.
- In the Sean Penn movie Shanghai Surprise, when Penn's character, Glendon, goes to a fancy restaurant he's mistaken by all and sundry for another character named Phil — who is never mentioned before or after this scene, nor is Glendon's resemblance. Nonetheless, the fact that Glendon looks like and is mistaken for Phil is a vital plot point without which the movie makes no sense (it's the reason Glendon was picked for the mission, it's how he gets an entree with a lady named China Doll, etc.).
- The film Spider is told from the perspective of its protagonist, a paranoid schizophrenic who has been released from a mental hospital. We see him reliving his childhood where it's revealed that he killed a woman who he was convinced had replaced his mother, who murdered her in conjunction with his father. He is, of course, wrong.
- Four Weddings and a Funeral plays with this trope:
Charles: How do you do - my name is Charles.Old Madman: Don't be ridiculous, Charles died twenty years ago.Charles: Must be a different Charles, I think.Old Madman: Are you telling me I don't know my own brother?
- Seymour in The Cannonball Run spends the whole movie pretending he's Roger Moore in-character, not just played by him. This allows him to pick up a whole series of women... at least, until one of them reveals that she joined him in his car because thinks he's George Hamilton. (No dementia involved, the woman is evidently just clueless.)
- The whole point of the old vaudeville joke "I'm not Rappaport".
- There's an old Yiddish joke set in Chelm, the legendary city of fools. It ends:
"You know, I don't know how I ever recognized you. Yankel, what has become of you?""I've been trying to tell you. I'm not Yankel.""Oy, you've gone and changed your name as well!"
- In a Hoka story by Poul Anderson and Gordon R. Dickson, the Hoka Sherlock Holmes persists in calling Alex Jones "Watson" — the real, which is to say Hoka, Watson is not there, and he can't avoid the pattern.
- The Hoka stories are a particular variation on this trope. The basic premise of the Hoka stories is that the Hokas (a highly intelligent race that just happen to resemble teddy bears) have trouble distinguishing fact from fiction, so whenever they come across a human novel they end up acting it out and Hilarity Ensues. It's never entirely clear when they do so whether they are conscious of the fact that it's just a re-enactment.
- Professor Binns in Harry Potter is constantly mistaking everyone for the students of centuries past. It's implied that he's so out of it, he doesn't even realize he died.
- The Animals of Farthing Wood. After Mole dies, Badger is pretty old and out of it by this time, so when he encounters Mole's son, Mossy, he mistakenly believes that Mossy is his father. Weasel, wanting to be kind to Badger is his last few years, asks Mossy to keep up the charade to spare his feelings.
- In Dan Abnett's Warhammer 40,000 Gaunt's Ghosts novel Straight Silver, some Ghosts find an old woman in the woods, and a deserter that she apparently thinks is her son.
- In Terry Pratchett's Discworld novel Feet of Clay, Old Mrs Gammage has been going to the same pub for decades. Now deaf, blind and senile, she's completely failed to realize it's become an undead hangout. The "monsters" are too nice to tell her the truth, so when we see her she's cheerfully calling a bogeyman "Charlie", and asking about his plumbing business.
- In A Hat Full of Sky, old Mr. Weavall keeps calling Tiffany "Mary" after his daughter, who died years ago. He eventually wises up, though, hinting his use of this trope is less senility and more wishful thinking.
- In the X-Wing Series a particularly old and addled man at a museum confuses Lara Notsil for someone else he once knew. In typical Star Wars fashion, he actually confused her for her mother, an Imperial Intelligence agent, like Lara/Gara/whatever-her-name-is-today herself. This confusion puts another Wraith on the trail to discovering her identity, no less. Initially made extremely funny, before the dramatic fallout happens later, by Face afterward pretending to 'recognize' her too, using increasingly-ridiculous names.
- In Choke, the protagonist's mother spends most of the book confusing him for someone else, and one of her fellow patients in the nursing home is convinced that he is her brother who molested her as a child.
- In Vivian van Velde's Now You See It, the main character's senile grandmother keeps calling her by the wrong name. It turns out this is because the main character traveled back in time and befriended her grandmother; her grandmother is calling her by the false name she gave.
- In Madeleine L'Engle's A Swiftly Tilting Planet, Mrs. O'Keefe calls Charles Wallace "Chuck." She turns out to be confusing him with her long dead brother.
- ...who Charles Wallace technically was. Sort of. It's that kind of book.
- In Edgar Rice Burroughs's Swords of Mars, he meets, while in disguise, a woman named Zanda, who comes from the city of Zodanga, destroyed because of John Carter's actions. She has sworn Revenge if she ever meets him. She therefore deliberately feigns this trope when she realizes the truth.
"I am very happy, Vandor," she replied, "happier than I ever expected to be in my life."
She emphasized the word Vandor, and I thought that I detected a smile lurking deep in her eyes.
"Is your happiness so great," I asked, "that it has caused you to forget your vow to kill John Carter?"
She returned my bantering smile as she replied. "I do not know anyone by the name of John Carter."
- Caster of Fate/Zero, Gille de Rais, cannot be convinced that Saber isn't Joan of Arc. Also counts as something of a Fandom Nod since that's often readers' first guess as to her true identity too.
- A woman named Bertha mistook Ephraim Kishon for the guy who made the drawings her dead husband liked so much, in the weekly newspaper he read. Kishon wrote for a daily, non-illustrated newspaper. That is, in the story. It tends to overlap.
- The Five Find-Outers (well, minus Fatty) once mistook Ernest Goon for Fatty, thinking he was in a clever disguise, and his repeated claims that he didn't know them and wasn't their friend just was a part of the disguise.
- In Angie Sage's Septimus Heap books, several ghosts always call Jenna Esmeralda. In Physik, she ends up in Esmeralda's time and everyone takes her for her.
- In Hero Years, I'm Dead features a poignant take on the trope. An old, long-since retired hero— once one of the greats— takes the protagonist for his oldtime archnemesis. Unusually, he's quite friendly despite this— the protagonist's behavior gives him the impression that said archnemesis has reformed. When he is killed in an ensuing supervillain attack, his last words are to his supposed archnemesis, "Be Good." The protagonist agrees on his behalf. It later turns out that there's even more to this— the mistaken identity was because the protagonist looks just like his supervillain father, and his agreement to "Be Good" is deeply meaningful to him because the elder hero turned him from his father's path with that injunction.
- In Big Trouble, after Arthur accidentally crashes into Enemy Toad and its hallucinogenic eye glands, he starts raving wildly under the impression that Roger is a demonic form of Elizabeth Dole, impervious to the fact that Roger is a dog.
- Played initially for somewhat tension-filled humor, then for tragedy in the first Dragonlance novel, Dragons of Autumn Twilight. The children of the very much human captives/slaves at Pax Tharkas are being used as hostages for their good behavior and "guarded" by an ancient, notionally "evil" but in reality very much senile dragoness who has come to think of them as her children (whom she lost centuries ago when she couldn't convince them to stay out of the war going on at the time). It ultimately leads to her Heroic Sacrifice when the slaves' escape attempt is discovered and the local evil overlord announces his intent to kill them all.
- There's an episode of Stargate SG-1 where Merlin repeatedly refers to the team and a few other characters present by the names of people he knew. He calls Mitchell "Percival", Jackson "Galahad", Carter "Guinevere" and Ba'al "Mordred".
- The third season's finale of Buffy the Vampire Slayer, "Graduation Day Part Two", has Willow watching over a poisoned and delirious Angel. Delirious, he mistakes her for Buffy and confesses how much he needs and loves her. She then leaves the room and tells Oz that he had thought she was Buffy. He replies "You too, huh?"
- Raising Hope has Cloris Leachman as Maw Maw, who thinks her great-grandson Jimmy is her dead husband. Traumatizing Frenching and ass-slapping ensue.
- An episode of CSI: New York drew upon a story from Real Life below. Two girls were in an auto accident. One was killed, while the other survived, albeit badly injured. However, the survivor was later murdered in the hospital. It turns out her killer was her own mother, who, like everyone else, believed her identity to be that of the other girl, whom she blamed for the accident. Her mother kills her in a misguided act of revenge, believing her to be someone else.
- This was also used as the basis of an episode of House where the doctors' efforts simply made the patient worse. It turned out, of course, that they were basing the treatment on the wrong medical records.
- In one episode of Justified Arlo mistakenly calls Boyd "Raylan." This is used to show that the elderly Arlo's mind is slipping as Boyd and Raylan are Bizzaro-like foils in the series. Raylan, Arlo's estranged, biological son, is a U.S. Marshal. Boyd, who Arlo treats like a son, is a career criminal and a series-long antagonist for Raylan.
- One episode of Lie to Me has Cal Lightman meeting a woman with Alzheimer's Disease who mistakes him for her (dead) husband, and insists that someone murdered her (also dead) sister. They eventually realize that she has attributed mistaken identities to virtually everyone in her life, and the fellow nursing home patient she'd confused with her sister was the victim of an Angel Of Death style Serial Killer. She'd witnessed the murder and had been struggling desperately through most of the show to remember it.
- One episode of Spitting Image had Ronald Reagan meeting Mikhail Gorbachev, but failing to recognize him, causing him to wonder what kept Leonid Brezhnev so long?
- An episode of Nash Bridges had this happen when Cassidy and her friend Angela got into a car accident. A doctor later tells Nash that Cassidy has died. After some despair, it's revealed that the girls' identities were mixed up and it was actually Angela that died. Despite the similarity to the case of Whitney Cerek and Laura Van Ryn below, the episode actually predates that incident.
- Averted or inverted in one episode of Highlander: The Series, a slightly senile old lady is sure that Duncan is her old lover. Her handler convinces her she is mistaken, as he's far too young. She later convinces herself that he must be her lover's grandson, and he doesn't undeceive her until she's about to die.
- Grey's Anatomy has Meredith's mother, who has Alzheimer's Dementia, mistake George for her ex-husband Thatcher. She also believed Meredith was still a child, so she didn't recognize her when she saw her.
- Invoked in As the World Turns by Paul Ryan in order to distract Dusty. He hires a woman named Josie who bears a striking resemblance to Jennifer, his sister and Dusty's recently deceased wife. After getting to know her, Dusty begins to believe that Josie has a connection to Jennifer rather than thinking she is really her, as Josie is pretending to have amnesia and "remembers" former events that actually happened to Jennifer.
- In the Angel episode "Damage", Dana is both mentally unstable and experiencing the collective memories of the previous Slayers, so she mistakes Spike for the man who murdered her family and tortured her, even though Spike doesn't look anything like him, and seeks revenge. Spike eventually convinces her she has the wrong guy, but she decides to kill him anyway for the crimes he is guilty of before Angel rescues him.
- Within Temptation's song "Say My Name" is about someone with Alzheimer's.
Please, say my nameRemember who I amYou will find me in the world of yesterdayYou drift away again, too far from where I amWhen you ask me who I am.
- "Keith, Meg, I'll need you to take over the Wet Noodle when I'm gone!" That's actually an act.
- In The Legend of Zelda: Majora's Mask, Anju's grandmother mistakes Link for her son, Anju's dead father. This is an act too.
- Then again, the Legend of Zelda timeline(s) are so screwy that goddesses know how many Links there have actually been.
- Mistaking Link might be a genuine accident, but she definitely uses this to trick her daughter into thinking she's senile as Anju is a terrible cook.
- Not quite a character, but in Tales of Symphonia, when you meet Raine's and Genis's mother, the poor woman has deluded herself into thinking that she's still pregnant with Genis and carries around a doll that she treats as baby Raine. When the real Raine and Genis appear, she refuses to believe they're who they say they are, and she orders them out of the house.
- What makes her especially deluded is that given the difference in her two children's ages, Raine would've been ten or eleven when their mother was still pregnant with Genis.
- The player in Vampire: The Masquerade – Bloodlines is approached by someone is certain that they recognize you, so certain that they suspect you of being on drugs when you don't recognize them. The only clue that they might actually know who you were is that if you let her phone other friends about you, you lose Masquerade points. An alternate interpretation is that the PC only denies knowing the person because they don't wish to associate with their old life now that their vampire form demands a very different lifestyle. The game does make the point that people who associate with vampires often meet misfortune of one kind or another.
- In Neverwinter Nights, the player is mistaken for the Teller Of Places's dead lover, until the player is able to convince her that she is wrong.
- In Xenogears, the two main protagonists, Fei and Elly have been re-incarnating since the dawn of "history" 10,000~ years before the start of the game. As such there are several characters (such as Krelian) who are functionally immortal who knew their previous incarnations. Emerelda was also created by one of their past incarnations as a Replacement Goldfish for the child Elly was incapable of having at that point in history. Emerelda refers to Fei as "Kim" because she actually believes that Fei is Kim and is a legitimate case of this trope in action. Krelian meanwhile knows full well that these are seperate people from the ones he was friends with 500 years ago, but calls them Lacan and Sophia anyway because its his way of keeping their memory alive.
- [PROTOTYPE]: the protagonist believes he's Alex Mercer, suffering from The Corruption. He's not; he's a strain of The Virus, unconsciously mimicking its first meal.
- Under a different definition of senility, 343 Guilty Spark in the first Halo game doesn't seem to see a difference between Master Chief and his long extinct creators, talking to Master Chief as if they've met before and referring to past conversations they've never had. The matter of who his creators are is one of the many hints across the lore of a connection between the two.
- It's made explicit by the end of Halo 3, where Guilty Spark comes out and says that humans are the Forerunners, or at least their direct descendants. This does not, however, stop him from going Ax-Crazy when he realizes that in order to save the galaxy from the Flood, Master Chief is planning on destroying "his" Halo again.
- A drunken Oghren from Dragon Age: Origins can do this to the player character, mistaking them for his ex-wife's lover Hespith and insisting that he won't let "some kind of moss-biting poetess" march into the Warden's camp.
- Street Fighter's Rufus does this so often that it's practically a character trait. He mistakes anyone blonde or wearing a gi for his assumed nemesis Ken Masters, who is both blonde and wears a gi. If the character's female Rufus simply assumes Ken is cross dressing or somehow making himself look smaller to fool him.
- Dark Souls: Absolutely hearbreakingly done with the Daughter Of Chaos. She is completely blind, in massive amounts of pain, and the only person who even speaks her language is her sister, Quelaag. The player can understand her using the Old Witch's Ring, but you are a Heroic Mime and can't talk back, so she therefore assumes that you must be Quelaag. Unfortunately, Quelaag is dead. Because you killed her during a Boss Fight, likely without even knowing she was anything more than just another random monster. You Bastard.
- Dragon Quest IX gives us the Wight Knight, who thinks that a princess is his lover from many years ago. Said knight has been dead for god knows how long, and only recently had been raised. His lover, and even his hometown, has been dead for a very long time - but the princess eventually plays along after hearing his plight, allowing his spirit to rest in peace.
- In No Rest for the Wicked, the witch calls the kidnapped children Hansel and Gretel. They explain that they are really Anna and Klaus. Later revelations show that her own children had been Hansel and Gretel and that she's made the same 'mistake' with other pairs of children who didn't get off as lucky as Anna and Klaus.
- When Pibgorn takes Dru as "Sylvia", Dru intervenes, seriously.
- In The 10 Doctors, a group of Renegade Daleks mistake the Sixth Doctor for their ally, "The Keeper". He decides to run with it for the moment. When a Dalek leader demands that he proves his identity, he accuses it of being an undercover Imperial Dalek with a paintjob, and demands that it proves its identity by explaining who "The Keeper" is.
- All Mr. Magoo cartoons.
- In The Simpsons episode "The Principal and the Pauper", returning soldier Armin Tamzarian visits Ma Skinner to deliver news of her son, his commander, being taken prisoner by Vietcong. She instead mistakes him for her son and he moves in, eventually becoming a school principal to honor his commander's dream. Judging from her behavior, she actually knows he's not her real son, but puts on the charade anyway. When the real Skinner returns and moves in, she doesn't like him as much.
- In South Park, Stan's grandfather constantly calls him "Billy".
- But then again, his grandfather called him Billy.
- In "Dances With Smurfs" some idiot murdered the 9-year-old morning announcer after he mistook him for the middle-aged man his wife was cheating on him with.
- Professor Farnsworth from Futurama has done this at least once. In the episode "Teenage Mutant Leela's Hurdles" He drives to Florida,(He was trying to catch his escaped gargoyle) then he stops at a cafeteria (It's implied he had been here before). He walks up to the counter and calls the cashier "Mavis" and says "surprised to see me back so soon" but then the cashier (Whose actual named Wanda) explains that "Mavis" had died years ago.
- In the Adventure Time episode "King Worm," the Ice King addresses Finn and Jake as Fionna and Cake; both a reference to a previous episode and a hint that he's just part of the dream.
- In The Powerpuff Girls episode "Abracadaver" the zombie of Al Lusion mistakes Blossom for the little girl who accidentally killed him.
- In Batman: The Animated Series, as Maximilian Zeus becomes more unhinged, he starts referring to Batman as Hades. By the time he's put into Arkham at the end of the episode, he believes it's Olympus and his fellow super-villains are various other Greek gods.
- This can happen when Alzheimer's and other forms of dementia get too advanced. It can be very hard on the people in question to continually be mistaken for someone else.
- The last time Adolf Hitler visited the old and senile president Paul von Hindenburg the day before the latter died, the latter believed he was Kaiser Wilhelm II. He called Hitler "Your Majesty" when he first walked into the room. The Kaiser (under whom Hindenburg had served as general) had been in exile since the end of World War I. Hitler had just passed a law that would give him absolute power after Hindenburg died. Everybody knows what happened after that...
- When Muhammad Ali visited a nursing home, one man confused him with Joe Louis. When one of Ali's handlers started to protest, Ali insisted on going along with it because it made the man so happy.
- A tragic example in which both identities being dead occurs in the documentary Boy Interrupted: Evan Scott Perry is Driven to Suicide by mental illness, and is laid to rest with his uncle Scott Perry, who was also driven to suicide by mental illness. At the funeral, Scott's mother/Evan's grandmother is wondering why they're having Scott's funeral again.
- In 2006, Taylor University students Whitney Cerak and Laura Van Ryn were among the victims of a severe automobile accident. Whitney survived; Laura did not. Due to the placement of a purse at the crash site, each girl was identified as the other, and the error was only discovered five weeks later when Whitney had sufficiently recovered from her head trauma.
- Charles-Louis Cadet de Gassicourt, Napoleon's pharmacist, was mistaken for Napoleon himself by an Austrian mental patient when he visited the Vienna asylum in 1809.