-> ''"And I don't want to hear anything about "I don't believe in vampires" because '''I''' don't fucking believe in vampires, but I believe in my own two eyes, and what '''I''' saw is fucking vampires!"''
-->-- '''Seth Gecko''', ''Film/FromDuskTillDawn''

Bob is a dyed-in-the-wool AgentScully. No matter what Alice tells him, he cannot accept that the truth is anything other than what his own common sense and experience tells him. Usually Alice, the hero, gets about as fed up as she can get with Bob, because Alice knows the truth and Bob. Will. Not. Listen. But then Bob runs into the monster, and suddenly finds that he can no longer pass it off as [[Film/MenInBlack swamp gas from a weather balloon that was trapped in a thermal pocket and reflected the light from Venus]]. This shocks Bob into dropping the IdiotBall very quickly, and very heavily.

In the blink of an eye, he goes from being AgentScully to being AgentMulder.

Often PlayedForLaughs, since the former skeptic is almost always the most rational denier up to this point. Bonus points are given if the skeptic is also an ObstructiveBureaucrat who suddenly comes to his senses. This sort of occurrence also helps to kick the action along since now they can treat it as SeriousBusiness. If they're unlucky, they might have caught a ContagiousCassandraTruth.




[[folder: {{Anime}} and {{Manga}}]]
* Kyon from ''LightNovel/HaruhiSuzumiya'' initially thinks he's the OnlySaneMan after Nagato, Mikuru and Itsuki tell him the truth about their nature as well as Haruhi's. Then, Ryoko tries to stab him, traps him in a sealed dimension, turns her arms into energy tentacles, then Nagato arrives, survives getting impaled by twenty spears, chants a couple of spells, and Ryoko dissolves. Needless to say, he's afterwards quick to believe in whatever he sees or hears from these three.
* Chisame in ''Manga/MahouSenseiNegima'' goes from the OnlySaneMan into... the only sane man aware that the universe she lives in doesn't make sense at ''all'' but whatever. She gets cool age changing pills and magic hacking powers if she plays along, right?
* In earlier parts of ''Manga/OnePiece'', Zoro says that he doesn't believe in dragons. Later on in Punk Hazard, when he and the crew meets an actual dragon, he's visibly surprised.

[[folder: ComicBooks]]
* Doctor Thirteen from Creator/DCComics is basically built around this. He's a parapsychologist who investigates spooky things in order to prove they're actually fake. His belief against the supernatural is so strong that it's said that is the reason why the paranormal doesn't work for him. His daughter, however, is a sorceress, the biggest slap in the face for him.

[[folder:Fan Fics]]
* In ''FanFic/RedactionOfTheGoldenWitch'', the adults of the [[VisualNovel/UminekoWhenTheyCry Ushiromiya family]] decide that Kinzo's rantings about magic and witches might not be so far-fetched after all. In fact, they're willing to try working BlackMagic themselves in order to solve their problems, and [[spoiler:bring Kinzo back via HumanSacrifice]].
* Sansa in the ''Literature/ASongOfIceAndFire''/''ComicBook/IronMan'' crossover ''FanFic/AManOfIron'' initially blows off the stories about Iron Man, since the scarcity of magic in Westeros makes a flying knight with magic beam weapons all but impossible. It's only when Ned confirms that the stories are fact that she becomes a big fan of the guy.

* In ''WesternAnimation/ScoobyDooOnZombieIsland'', the gang has spent so much time busting fake monsters and other weirdos that when strange things start happening, they don't immediately accept that it really is supernatural this time. Fred, in particular, seems determined to play AgentScully when they run into the zombies--until he pulls one of their heads off. And the zombie reattaches it. The denial vanishes ''very'' quickly.

* Mike Enslin in ''Film/FourteenOhEight'' is a professional skeptic who makes it his life's work to go around reviewing supposedly haunted locations. When he checks into the Dolphin Hotel's titular room [[{{ThirteenIsUnlucky}} 1408]], against the urging of virtually every single member of the hotel staff, he learns very quickly how much he screwed up.
* The marines in ''Film/{{Aliens}}'' were pretty much uniformly contemptuous of Ripley's description of the xenomorphs, refusing to believe that they could be as effectively lethal as she was saying. After all, they were rough, tough hardcore marines. Suffice to say they found religion pretty damned quick...
* Captain Lorenzo in ''Film/DieHard2'' believes John [=McClane=] that Colonel Stuart and Major Grant are working together only after [=McClane=] empties a submachine gun (the same kind used by the soldiers in their attack against the terrorists) full of blanks at him. Lorenzo then calls in the cavalry.
* ''Film/FromDuskTillDawn'': The fact that vampires are real comes as a shock to everyone... but they get over it quickly.
* In ''Film/TheSixthSense'', Doctor Malcolm Crowe believes that Cole Sear's problems stem from some sort of schizoaffective disorder... until he encounters something that turns his skepticism on its head.
* In ''Film/SplitSecond'', Detective Dick Durkin refuses to believe that the SerialKiller he and Harley Stone (his partner) are tracking isn't actually a human being at all, but rather some kind of monster. And then he runs face-to-face with the thing.
--> '''Stone:''' Did you see him?
--> '''Durkin:''' That wasnae a him, that was a fucking ''it''!
** Seeing the monster also leads to Durbin's line, "We need to get bigger guns!", which under the circumstances was a very rational reaction.
* ''Franchise/{{Terminator}}'':
** Sarah Connor starts [[Film/TheTerminator the first film]] only knowing that there is a SerialKiller hunting down women with her name all over Los Angeles, and is completely unable to believe Reese's story (she even tries to run away a couple of times while he's saying it, even after he saved her life when the Terminator tried to kill her. The fact that Dr. Silberman labels Reese as a complete nut job and the cops theorize that the Terminator is wearing body armor and may be on PCP also keeps her on the skeptical side for a little while longer). By the time the Terminator finds her again and slaughters its way through a police station single-handedly, she is a total believer and by the time of ''Terminator 2'', she has taken all the measures she could to prepare herself and John for the RobotWar ahead and tried to do some damage to prevent Skynet from becoming a threat... which, quite understandably, landed her in an insane asylum.
** The arcs of both John Connor himself and Miles Dyson on ''Film/Terminator2JudgmentDay'' are to consider that Sarah is a complete loon and what she spouts isn't real (and John, who grew up around her, is pretty bitter about it) but they immediately come around when they encounter the Terminators.
** Doctor Peter Silberman encountered proof that [[CassandraTruth Sarah Connor wasn't crazy]] in ''Film/Terminator2JudgmentDay''. By ''Series/TerminatorTheSarahConnorChronicles'', he's living in isolation, away from major cities, raising dogs and keeping a healthy sense of paranoia about killer robots disguised as human beings. He even apologizes for not believing in Terminators, not that it does him much good.
** However, this isn't the case in movie continuity. He appears in ''Film/Terminator3RiseOfTheMachines'', as Scully as ever, and ascribes his experience with Terminators to psychological trauma (before recoiling in fear at the sight of the Terminator showing up ''again'').
* Oh, come on, Franchise/IndianaJones. In ''Film/RaidersOfTheLostArk'' he remarked that despite being an expert on the occult he doesn't believe in magic, superstition, (and in ''Film/IndianaJonesAndTheKingdomOfTheCrystalSkull'', aliens.) yet in ''Raiders'' and ''Skull'' he believes it enough to get the hell out of there and or not look at the item that would have killed him.
* In ''Film/TheWomanInBlack'', Sam Daily finally acknowledges the supernatural nature of the house and the existence of the ghost in the last act, and helps Kipps lay the ghosts to rest. Well, he tries...
* In ''Film/TheHaunting1963'', Luke Sanderson is flippantly skeptical that anything supernatural is going on at Hill House, no matter how creeped out the rest of the cast (and the audience) is getting. But by the end of the movie, even he has given in, declaring that the house ought to be burned down and [[SaltTheEarth sown with salt]].
* In ''Film/CatPeople'', Oliver doesn't believe in the story of cat people Irena tell him about. At the end of the movie, when he finds her body shapeshifted into a panther, he realizes how wrong he was.
* In ''Film/PiratesOfTheCaribbeanTheCurseOfTheBlackPearl'', Miss "Turner" (actually Miss Swan) tells Captain Barbossa she doesn't believe in ghost stories. She then sees the crew by the moonlight and discovers that the ship she's on (The Black Pearl) is crewed by the undead.
-->''"You best start believing in ghost stories, Miss Turner... you're in one!"''
* In the ''Franchise/StarWars'' franchise, contrast [[TheLancer Han Solo]] in ''Film/ANewHope'' and again over thirty years later in ''Film/TheForceAwakens'':
-->'''Han (younger, ANH)''': Kid, I've flown from one side of this galaxy to the other, and I've seen a lot of strange stuff, but I've never seen ''anything'' to make me believe that there's one all-powerful Force controlling ''everything''. 'Cause no mystical energy field controls ''my'' destiny. It's all a lot of simple tricks and nonsense. \\
'''Han (older, TFA)''': I used to wonder about [the Jedi] myself. I thought it was a bunch of mumbo jumbo. A magical power holding together good and evil, the Dark Side and the Light? The crazy thing is... it's true. The Force. The Jedi. ''All of it.'' It's all true.
* ''Film/FrightNight1985''. Peter Vincent did not have faith in God, so when he tried to use a cross against the vampire Jerry Dandrige it didn't work. Let's just say that the next time Peter puts a crucifix in Dandrige's face, after Peter has killed a vampirized Evil Ed, it turns out very differently for Dandrige.
* In ''Film/DoctorStrange2016'', Strange quickly comes around to the "magic is real" camp after The Ancient One shows him a thing or two. (Such as punching his astral form '''''right out of his body'''''.)
-->'''Strange:''' Teach me...

* A skeptical atheist walks around near Loch Ness. Suddenly, the Loch Ness monster erupts from the water and grabs him. In panic, he shouts "Oh Lord, save me!" {{God}} answers: "You dare to ask me for help, when you didn't believe in Me one minute ago?" The atheist says: "Have mercy, Lord - one minute ago I didn't believe in the Loch Ness monster either!"

* Paksenarrion, from Elizabeth Moon's ''Literature/TheDeedOfPaksenarrion'', gradually changes from a skeptic to a believer to a full-blown Paladin of St. Gird; the Girdish medallion Canna left to Paks when Canna died gives the first signs when it starts warning Paks of dangers.
* At the end of ''[[Literature/{{Temeraire}} Victory of Eagles]]'', General Wellesley declares himself a convert to the idea that the [[OurDragonsAreDifferent Dragons of the]] [[LivingShip Aerial Corps]] are in fact fully [[SapientSteed sentient]]... then declares that he will be "damned if I will let you make them political" and manages to get [[HonorBeforeReason convicted traitor William Laurence's sentence of death commuted to Transportation to Australia on the condition that he take the most obvious prospective rabble-rouser (Temeraire himself) with him.]]
* In ''[[Literature/{{Xanth}} Man from Mundania]]'', Grey Murphy refuses to believe in magic after being brought into Xanth, until he encounters a river flowing ''up'' a cliff and simply can't come up with a scientific explanation for it. It helped that his magic talent was AntiMagic, so he kept unconsciously nullifying magic near himself, such that some of the things Ivy tried to show him didn't work.
* Professor Summerlee in ''Literature/TheLostWorld1912''.
* WordOfGod stated that Cloudtail and Mothwing of ''Literature/WarriorCats'' stopped being atheists after [[spoiler:an army of dead cats invaded the Clan territories and a second army of dead cats helped the Clans]] in ''The Last Hope''. In later books (that were not planned at the time of the statement) it is shown that Mothwing actually ''still'' doesn't believe in [=StarClan=].
* Dr. Claymore from the ''Literature/PercyJacksonAndTheOlympians'' short story "Son of Magic." Then again, being attacked by Lamia and befriending a son of Hecate will do that to you. [[spoiler: Not to mention dying, meeting a goddess, then coming back to the mortal world as a familiar.]]
* In ''Literature/TheSanguineChronicles'', Marko's friend Janie is a hardboiled skeptic when it comes to the supernatural. Then she discovers Marko is a werewolf/vampire hybrid when she catches him mid-shift.
* In the original ''Franchise/DragonLance'' trilogy this applies to pretty much the whole world. The gods stopped responding to prayers and providing clerics with powers after the [[ColonyDrop Cataclysm]]. Centuries later at the time of the books, the gods have been largely forgotten and even those who remember their names consider them to be myths. The same applies to dragons which haven't been seen for even longer. Events quickly convince everyone that both the gods and dragons are very real.
* ''Literature/{{Dracula}}'': Two examples of this
** Harker at first thinks the village is just being superstition despite being an outsider to Transylvania (though they don't really tell what the danger is, just that it's a ''really'' bad idea to go to Dracula's castle). But after meeting the count, finding how strange he and his dwelling are and ultimately nearly being bitten by his vampire brides, it doesn't take long for him to become a believer.
** Later after Lucy dies from Dracula succeeding in draining her blood, Van Helsing tries to convince Seward, Arthur and Quincy that she will become a vampire and be a danger to all. Naturally they think he's coo coo, So Van Helsing decides he needs to show them first. He starts with Seward, his trusted student, as they watch Lucy's coffin and indeed find it initially empty then after waiting a bit, find it filled again with her body, only to discover she hasn't decayed since she was interred and in fact much more beautiful then ever. The following night, Van Helsing gathers the rest of the men and confront Lucy directly as she prowling the night. Indeed, seeing her bearing fangs with bits of blood on her lips, acting not at all like the Lucy they know (feral and seductive instead of kind and caring), acting fearful of a cross and using her powers to flee back to her coffin is more then enough proof to the men that vampires and the threat they pose are real.

[[folder:Live Action TV]]
* ''Series/GameOfThrones'': Growing up in the CrapsackWorld of Westeros, and especially his family, made Tyrion a cynical man and so he never had any faith in anything even himself. However after meeting Daenerys and seeing the wonders she can do Tyrion admits to her that he now believes in her and her vision for the future. When he meets Jon Snow again in Season 7 he even admits that he know believes his tale of White Walkers when the Tyrion of the first season sarcastically referred to the things beyond the Wall as "Grumkins" and "Snarks".
* In the ''Series/HowIMetYourMother'' episode "Matchmaker" Marshall and Lily (both a bit superstitious) are convinced their apartment is infested by a mutant combination of a cockroach and a mouse (which they dub a cockamouse). Robin plays the role of skeptic until the end when she finally sees the cockamouse herself ([[TakeOurWordForIt though we never do]]), and it's revealed that somehow the cockamouse can fly too.
* In ''Series/TheXFiles'', [[AgentScully Dana Scully]], originally the hard core skeptic of the dynamic duo, became the believer (with her new partner, Agent Doggett, who took the role of the skeptic) when [[AgentMulder Fox Mulder]] was PutOnABus.
* ''Series/{{Lost}}'s'' Jack after he returned to the Island. Previously he denied everything supernatural or odd, even if it happened right in front of him and other people saw it. Once he became a believer, he went to the opposite extreme-believing ''everything''. Such as lighting dynamite right next to him on a slight chance that he can't die...
* On ''Series/{{Supernatural}}'' [[InspectorJavert Agent Henriksen]] spent most of his time ruthlessly pursuing Sam and Dean, whom he believed to be {{serial killer}}s with psychotic delusions. Seeing a mass outbreak of demonic possession up close changed his opinion on a lot of things, and he chose to help them. [[spoiler: Sadly he was killed in the same episode.]]
* Emma Swan of ''Series/OnceUponATime'' initially did not believe that The Evil Queen from ''Literature/SnowWhite'' had cursed a bunch of fairy tale characters to be trapped in our world. Seeing Henry fall unconscious with no apparent cause and subsequently fighting [[Disney/SleepingBeauty Dragon Maleficent]] disabused Emma of her skepticism.
* Zak Bagans, the leader of the ''Series/GhostAdventures'' crew, is the one who has the best time relating to skeptics they encounter during investigations because he himself used to be a total skeptic when it came to the ghosts and the supernatural. In the original opening for the show, Zak explains that he never believed in ghosts until he came face-to-face with one--in Zak's case, it was the ghost of a woman who had committed suicide in an apartment complex that he once lived in while residing in Michigan. Ever since then, Zak's become investigator of the paranormal.
* Throughout the first two seasons of ''Series/StarTrekEnterprise'', T'Pol refuses to even entertain the possibility of time travel, simply because the Vulcan Science Directorate has declared it impossible. Then in season 3, she and Archer are sent back to 21st century Detroit; from then on, she's far more accepting of time travel.

[[folder:Video Games]]
* ''VideoGame/CliveBarkersUndying'': Patrick started his career as an OccultDetective trying to "debunk folklore and mysticism." Presumably he stopped trying to disprove the supernatural at the latest by some point between obtaining the clearly magical Gel'ziabar stone and gaining a German wizard as an archrival.
* In ''VideoGame/AlanWake'', Sheriff Breaker spends most of the time thinking that Wake is having a mental breakdown, and doesn't believe his stories of shadowy attackers and monsters. And then Agent Nightingale is stolen by the darkness right in front of her. One of the first things she says after she witnesses Nightingale's death is "Tell me how we can stop these things" with no hesitation at all.

[[folder:Tabletop Games]]
* A DiscussedTrope on the gamemaster section of the D20 version of ''TabletopGame/CallOfCthulhu'' as a regular character arc for a beginning [[PlayerCharacter Investigator]], with Sarah Connor's arc in ''Terminator'' above provided as a comparison.

[[folder:Web Comics]]
* ''Webcomic/GirlGenius'': Carson Von Mekhan, the former seneschal of Castle Heterodyne and secret ruler of Mechanicsburg during his masters' long disappearance, was of course initially dubious of Agatha's claim of being the real Heterodyne heir. Seeing Agatha in action wore down his doubts, and they were banished completely when she made the kill-happy Castle Heterodyne back down from killing Herr Diamant for doubting that there even ''was'' an heir.
** Vanamonde, his grandson and successor, was dispensed from skepticism even earlier, once he had a sip of Agatha's special coffee brew and had a [[MustHaveCaffeine coffee connoisseur]] nirvana moment. And then he wouldn't shut up about the "perfect coffee".
* ''Webcomic/{{Homestuck}}'': We see in some flashbacks that the Kids have been getting contacted by the trolls periodically throughout their lives, but they've never believed that the trolls were anything other than... well, Internet trolls. When the Sburb session starts up and they get transported into the Medium, and all the other weirdness that happens, they are suddenly much more inclined to believe what the trolls have to say.
* ''Webcomic/StandStillStaySilent'': One of the storylines is the OddFriendship between FlatEarthAtheist Emil and mage Lalli. At the end of Chapter 16, Lalli ends up needing to use magic right under Emil's nose, which shows Emil that not only does magic exist, but the "mage" on Lalli's resume was ''not'' just some kind of fancy non-literal title.

[[folder:Western Animation]]
* Captain Black of ''WesternAnimation/JackieChanAdventures'' gets this in the Season One Finale. Shendu? In ma base, steeln d talizmans? '''''Whoa, Nellie!''''' I'm okay now, let's defeat magic with magic!
* Happens to Eduardo in the first episode of ''WesternAnimation/ExtremeGhostbusters''. His ''very first line'' is "Ghosts. Yeah, right." Then Slimer shows up, and by the end of the episode, Eduardo is a Ghostbuster.
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'': In "Feeling Pinkie Keen," Twilight Sparkle is dismissively skeptical of Pinkie Pie's "Pinkie Sense," even though Applejack (who has lived in Ponyville a lot longer that Twilight) confirms that it's real. At first she insists that Pinkie's ability to predict certain events just before they happen is nothing but coincidence. Then she tries to analyze ''how'' the Pinkie sense works, because (as Pinkie points out) Twilight can't believe something she doesn't understand. After being repeatedly smacked in the face by compelling evidence, Twilight accepts that the Pinkie sense exists, even though she can't explain it.