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1[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/theexorcist1973.jpg]]
2[[caption-width-right:300: ''"The power of Christ compels you!"'']]
3
4->'''Psychiatrist:''' Is there someone inside you?
5->'''Regan [=McNeil=]:''' Sometimes.
6
7''The Exorcist'' is a 1973 ReligiousHorror film (though the director, Creator/WilliamFriedkin, doesn't view it as such). It's the first movie of ''Franchise/TheExorcist'' franchise and credited as the TropeMaker and TropeCodifier for HollywoodExorcism.
8
9[[TheFilmOfTheBook Based on]] the [[Literature/TheExorcist 1971 novel]] by William Peter Blatty (who also wrote the film), [[VeryLooselyBasedOnATrueStory and inspired by]] what was supposedly an actual documented exorcism from 1949, ''The Exorcist'' is the terrifying, shocking tale of an originally rather cute 12-year-old girl named Regan [=McNeil=] (Creator/LindaBlair) and the efforts of her famous film actress mother Chris (Creator/EllenBurstyn), her mom's secretary Sharon, and a pair of priests to save the poor girl's soul from the ravages of a powerful, malign entity called Pazuzu (though his name is kept ambiguous in the film).
10
11Initially manifesting as strange behavior in little Regan and her Ouija-board trysts with an [[ImaginaryFriend invisible companion]] calling itself Captain Howdy, the being's infiltration is at first dismissed as Regan acting out frustrations after her mother's divorce. As the demon takes hold of Regan, however, she undergoes drastic changes in appearance and behavior, manifesting physical symptoms and incredible strength that cannot be explained by medical science. After Regan starts gliding around the house on all fours ''face up'', licking Sharon's ankles, her mother decides that it is time to consult a higher authority...
12
13Creator/MaxVonSydow and Jason Miller star as the two priests, Father Merrin and Father Karras, while Creator/LeeJCobb appears as police detective Lt. William Kinderman.
14
15The original movie is considered one of the best (and ''[[NightmareFuel/TheExorcist most terrifying]]'') [[note]] It has a well-earned rank of #3 on AFI's "Thrills" list, while Regan [=McNeil=] is ranked #9 among its "Villains", with equal or higher rankings on similar lists [[/note]] horror movies of all time, and was followed by two sequels and (for complicated reasons) two versions of the same prequel, with varying levels of quality and success from each of them. A TV series of the same named premiered on Creator/{{FOX}}, which was later revealed to be another sequel to the original. There's also a very, [[MindScrew very weird]] non-horror, semi-spinoff movie called ''Film/TheNinthConfiguration'', adapted and directed by Blatty himself from his earlier novel of the same name, which is set in the same universe as this movie but has very few direct connections to it.
16
17Parodied in 1990's ''[[Film/RePossessed Repossessed]]''.
18
19A new trilogy of ''Exorcist'' films from director David Gordon Green (''Film/{{Halloween|2018}}''), produced by Creator/{{Blumhouse|Productions}} and jointly distributed by [[Creator/{{Universal}} Universal Pictures]] and Creator/{{Peacock}}, has been announced, with the first film, titled ''Film/TheExorcistBeliever'', released theatrically on October 6, 2023;[[note]]The release was initially planned for October 13 (a Friday, natch), but the massive pre-sales for ''Music/TaylorSwift: The Eras Tour'' forced Universal to bump up the release to avoid competition.[[/note]] this series will also be a sequel to the original film and feature Ellen Burstyn and Linda Blair returning as Chris and Regan. ''Believer''[='=]s release fell just over two months shy from [[MilestoneCelebration the original's fiftieth anniversary]].
20
21----
22
23!!! ''The Exorcist'' is the {{Trope Namer|s}} for:
24* ExorcistHead
25* ThatThingIsNotMyChild
26
27!!"That Trope Is Not My Child!":
28* AbnormalLimbRotationRange: One of the film's most iconic shots features the possessed Regan [[ExorcistHead rotating her head until she is facing backwards]].
29* AbortedArc: Kinderman's investigation into the death of Burke leads him to suspect that a priest might somehow be linked, perhaps having to do with the desecrations at Holy Trinity[[note]]these are all done by the demon using Regan's body and art supplies without her knowledge[[/note]] which he's previously spoken with Karras about; Karras speculated it's a "sick priest". Kinderman later insinuates that perhaps Karras himself might be the "sick priest". Aside from the fact that Burke's neck was broken in a particular way supposedly used by devils to murder witches, and the desecrations might be "Satanic" (they're mostly burlesque sexual satire), there's no real evidence leading him to this speculation. It gets dropped with no resolution, but when Kinderman speaks to Karras for the last time, late in the book, he lets on without saying it explicitly, that he has figured out there actually is a demon and that it killed Burke and possessed the little girl.
30* ActorAllusion: When Father Karras and Detective Kinderman banter back and forth, Karras tells Kinderman he looks like Creator/PaulNewman while Kinderman says that Karras looks like Creator/SalMineo. Kinderman was played by Creator/LeeJCobb, who co-starred with Newman and Mineo in the 1960 movie ''Film/Exodus1960''.
31* AllGermansAreNazis: Burke invokes this when he gets drunk at Chris' party. He asks Karl, a member of Chris' domestic staff, whether he did public relations or community relations for the Gestapo. Karl angrily replies that he's Swiss, but Burke is too drunk to care about the difference, and he continues badgering Karl about his supposed Nazi past until he attacks him in a rage.
32* AllThereInTheScript: The demon possessing Regan is named Pazuzu in the script but its name isn't mentioned in the film.
33* AndIMustScream: Heavily implied to be happening to Regan while Pazuzu possesses her.
34-> ''help me''
35* ArbitrarySkepticism: Invoked, and actually a major plot point. Chris thinks Father Karras and the doctors treating Regan are absurdly resistant to consider that Regan really is possessed, especially after various medical tests uncover no obvious illness. But as Karras points out, the modern Catholic Church has such high standards for performing an exorcism that they have to exhaust ''every'' rational explanation before they can assume the victim is actually a victim of demonic possession. The book goes into extensive detail about just what has to be studied and ruled out.
36* ArtImitatesArt: The iconic shot of Merrin arriving at the house was inspired by the 1954 painting ''Empire of Light (L'Empire des lumières)'' by René Magritte. It also bears a strong resemblance to [[http://s3.amazonaws.com/criterion-production/posts/1900-d3197eafedc205e9f15d2cbdb9211e9a/Night_of_the_Hunter_Still_original.jpg this shot]] from ''Film/TheNightOfTheHunter''.
37* ArtisticLicenseReligion:
38** One scene shows Karras breaking the communion host during the Eucharistic Prayer while speaking the words of consecration. While Karras gets the words right, in an actual Catholic Mass the breaking of the bread takes place later, just prior to the priest taking communion.
39** The scene shows only Fathers Merrin and Karras participating in the exorcism. In cases where the possessed is female the church has specified that there should be one other female present if possible in order to assure "propriety and discretion" on the part of the others performing the rite.
40** According to official guidelines an exorcist should avoid performing an exorcism alone, which Father Merrin does when he sends Father Karras out of the room.
41* AvantGardeMusic: The movie features Music/KrzysztofPenderecki's Kanon, The Devils of Loudon, Cello Concerto, String Quartet & Polymorphia.
42* BeatTheCurseOutOfHim: After all the enchantments, crosses and holy water, it took [[spoiler: Karras]] punching the crap out of the possessed Regan in order to drive the spirit out of her [[spoiler: and into him.]] (In the book, he just ''talked'' Pazuzu into it, in a kind of street fight attitude.)
43* BigBad: Pazuzu, the demon who is possessing Regan.
44* BigNo: Karras just before [[spoiler: he kills himself to prevent Pazuzu, who has gone inside of him, from killing Regan.]]
45* BittersweetEnding: [[spoiler:The two priests die, but they save Regan.]]
46* BloodSplatteredWeddingDress: Bile-splattered. Throughout the scenes where Regan is fully possessed, she wears a pretty blue nightgown with ruffles and flowers. The subtext could be that Chris dressed her in this to communicate her love.
47* BodyHorror: The movie is full of this. There's the (initially deleted) scene where Regan climbs down the stairs like some kind of spider monster, Regan getting [[EvilMakesYouUgly more and more hideous and deformed the longer she's possessed,]] and, of course, the ExorcistHead scenes.
48* BookEnds: The first shot of the movie[[note]]in the "Version You've Never Seen" cut, anyway[[/note]] is an apartment light going off. At the end of the film, the light's back on.
49* {{Bowdlerise}}: Some TV edits change "'''''YOUR MOTHER SUCKS COCKS IN HELL!!!'''''" to "'''''YOUR MOTHER STILL ROTS IN HELL!!!'''''"
50* BreakThemByTalking: Pazuzu is ''very'' good at it.
51-->'''Pazuzu:''' ''(using Karras' mother's voice)'' Dimmy, why did you do this to me? Please, Dimmy, I'm afraid.\
52'''Karras:''' '''''You're not my mother!'''''
53* BringMyBrownPants: Happens when Regan wets herself while scaring everyone, most probably including herself.
54* BrownNote: [[http://theexorcist.warnerbros.com/cmp/silencebottom.html Many sound effects were put in (sometimes deep in the mix) to make it more unsettling]] - for instance, pigs being herded for slaughter and [[ScaryStingingSwarm angry bees]].
55* CATTrap: As one transcript puts it, "a huge machine, two pieces on either side of Regan's head and a piece above."
56* CharacterCatchphrase: Burke is fond of using the adjective "cunting", which is what Pazuzu uses to mock Chris in WouldYouLikeToKnowHowTheyDied below.
57%%* ChekhovsGunman: Father Merrin.
58* ChildrenAreInnocent: Linda Blair didn't know about masturbation when she did the movie and thought nothing of the profanity or the scene where she pushes Ellen Burstyn to her crotch. In her mind, it was Regan doing those things, not her.
59* ChristianityIsCatholic: Obviously, as it is the only church to offer exorcism as a practice. This is TruthInTelevision. The Lutheran minister of the parents of the child in the real life case the movie is based on told the parents to get a Catholic priest because Lutherans had no exorcism tradition. The apparent anomaly of Damien Karras and his mother being Roman Catholic when most Greek Christians are Eastern Orthodox is explained by their status as Frankoi, meaning they are among the 200,000 [[https://en.wikipedia.org/wiki/Catholic_Church_in_Greece Greeks who practice Roman Catholicism.]]
60* ClusterFBomb: Pazuzu's very prone to dropping these.
61-->'''Regan/Demon:''' Let Jesus fuck you! Let Jesus fuck you! Let Him fuck you!
62* {{Confessional}}: At the end of the movie, [[spoiler:Father Karras commits suicide to get rid of the demon, who has recently possessed him. Father Dyer arrives just in time to take his confession, but Karras is unable to speak and just squeezes Dyer's hand as a confirmation that he repents his sins]]
63* ConsummateLiar: "He is a liar. The demon is a liar. He will lie to confuse us. But he will also mix lies with the truth to attack us.
64* CountryMatters: When Regan is possessed by a demon, she swears a lot and uses this word among the [[ClusterFBomb vast range of swear words that she has]]. One of her lines says: "Do you know what she did, your cunting daughter?"
65* CPRCleanPrettyReliable: Uh, Damien, that's not how you do CPR, and you as a doctor should know that. Naturally, he's pretty distraught, exhausted, and not thinking clearly.
66* CreatorCameo: William Peter Blatty, author of the original book and screenwriter of the film, appears on Burke Dennings' film set.
67* CrisisOfFaith: Father Karras at the beginning of the film.
68%%* CrustyCaretaker: Karl.
69* DarkIsNotEvil: The scene when Merrin arrives (as seen in the poster image above), the priest is clad in black, while [[LightIsNotGood white light emanates from the demon's room]].
70* DeadpanSnarker: Burke Dennings. [[spoiler: Even when he's dead. If that's really him.]] Lt. Kinderman and Father Dyer aren't far behind in levels of snarkiness.
71* DecoyProtagonist: While the film starts off focusing on Merrin and then Chris, it quickly becomes clear that Karras, initially only seen in brief cameos, is the true protagonist the second the film begins to focus on him.
72* DemonicPossession: Present and accounted for, sir! Subverted in that Regan claims she's possessed by the Devil himself, which Karras dismisses, saying it's like claiming you're Napoleon. [[spoiler:It's all part of the MindScrew by Pazuzu to sow doubt.]]
73* DevilButNoGod: The power of God/Christ does seem to be more powerful than the power of the Devil but God seems absent for the most part.
74* DoesThisRemindYouOfAnything:
75** The medical scenes are treated like ''scientific'' exorcisms, complete with a lighted cross that resembles a crucifix.
76** Regan is on the verge of puberty, and a lot of the film plays on the fears parents have of their daughters finding their sexuality. (Taken to ''extremes'', surely, but the hormonal mood changes, the developing sexual urges, and so on are parodied by Pazuzu.)
77* DyingAsYourself: Father Damien invites the demon who possesses Reagan into him in order to save her. This causes his skin to go white. The moment just before he flings himself out of the window, his skin returns to normal.
78* EverybodySmokes: A number of the adult characters in the film smoke, including both Chris [=MacNeil=] and Father Karras. Ash trays are a bit more prevalent too, even in the conference room of the Archdiocesan headquarters.
79* EvilIsDeathlyCold: Regan is a victim of DemonicPossession and her bedroom is shown at times to be so cold that other characters pause to put on heavy coats before entering the room.
80* EvilPlan: ''The Exorcist'' is [[spoiler: Pazuzu's revenge on Fr. Merrin for evicting him from a child in Africa.]]
81* EvilSoundsDeep: A twelve-year-old girl should ''not'' sound like Mercedes [=McCambridge=].
82* ExorcistHead: The reason for it isn't clear in the film and only subtly explained in the novel, but the demon is taunting Karras with knowledge that she (it) knew how Burke Dennings died (having his neck snapped, twisting his head around 180 degrees from his tumble out of the window.)
83* FakeOutOpening: The movie begins with an archeological dig.
84* FantasticCatholicism: Well, Catholic priests in a completely outrageous and abnormal situation.
85* {{Foreshadowing}}:
86** The two dogs mindlessly attacking each other in the street, as Merrin mentions "evil against evil".
87** As [[http://www.filmsite.org/exor.html noted]] by Filmsite.org:
88--->Chris grabs a bullhorn and tells the rebellious students in the crowd: "If you want to effect any change, you have to do it within the system," a long crane shot finds Father Karras walking away from the crowd and the filming - he turns back to watch for a moment, and then continues his departure in serious thought. [To accentuate one of the film's themes, the actor's lines are deliberately juxtaposed with the priest's departure, since he is experiencing an inner struggle of religious faith within his own system - the church.]
89** When Pazuzu remarks that an exorcism would bring Regan, Karras, and him together, [[spoiler: he was right because he ends up possessing Karras.]]
90** Merrin is shown taking medication in the opening sequence, when he's an archaeologist in Iraq. He dies of a heart attack at the climax when confronting Pazuzu.
91* ForTheEvulz: Seems to be Pazuzu's entire reason for possessing and torment Regan, as it's not like it benefits him in any way. ''Seems'' to be. It's actually a setup for a grudge match smackdown vs. Fr. Merrin. Filmgoers probably had other things on their minds and might not realize this.
92* FreudianExcuse: Invoked. Everyone, including Chris, thinks Regan's conversations with "Captain Howdy" is her desire to see her father, whose name is Howard, more often. After discussing Captain Howdy, Regan is seen reading a ''Photoplay'' magazine with the headline: "Big Trouble In the [=MacNeil=] Marriage! The Night Howard Walked Out On His Wife." (The cover has a photo of Chris and Regan, with Regan looking tired and a bit grim.)
93* GeorgeLucasAlteredVersion: An altered version, ''The Version You've Never Seen'', containing several minutes of additional material (including a scene of Regan "spider-walking" down a staircase which Friedkin had [[DeletedScene deleted]] from the original cut due to technical problems, and which bore no resemblance to the spider walk in the book) and added CGI and subliminal imagery, was released to theaters in 2000.
94* GhostlyChill: A major feature of the demon's presence. It's ''freezing'' in there. When they were making the film they built the set for Regan's room ''inside a freezer'', so you could see everybody's breath. One day it actually snowed inside the set. Though hundreds of hours of filming, Linda Blair wore nothing but a thin nightdress. To this day she cannot stand being cold.
95* GigglingVillain: After Merrin dies of a heart attack, Regan/Pazuzu is giggling like a madman. In the book, he is not laughing, but raging at the old man "You would have lost and you know it! Come back!" (The demon's goal was to possess Merrin as LaserGuidedKarma, but was foiled there.)
96%%* GoodShepherd: Father Merrin and Father Dyer.
97* GoodWingsEvilWings:
98** Inverted by Pazuzu. The wings on the stone idol he was released from are actually birdlike.
99** [[http://content8.flixster.com/question/41/64/93/4164930_std.png Regan's goony-bird statuette]] has wings like Pazuzu's and a somewhat similar pose.
100* GroinAttack:
101** Self-inflicted (sort of), with a crucifix, as possessed-Regan uses it as a dildo.
102** Regan's attack on the psychiatrist.
103* HeroicSuicide: [[spoiler:Fr. Karras kills himself to save Regan and get rid of Pazuzu. HarsherInHindsight if you accept ''Exorcist III'' as canon.]]
104* HollywoodExorcism: A necessity, because the Catholic Church's reluctance to perform exorcisms was explicitly mentioned.
105-->'''Chris:''' How do you go about getting an exorcism?\
106'''Karras:''' I beg your pardon? Well, the first thing -- I'd have to get into a time machine and get back to the 16th century... Well, it just doesn't happen any more, Mrs. [=MacNeill=]... since we learned about mental illness, paranoia, schizophrenia... Since the day I joined the Jesuits, I've never met one priest who has performed an exorcism. Not one.
107* HolyBurnsEvil: Demon-possessed Regan's reaction to what a priest says is holy water.
108* ImaginaryFriend: What Chris assumes Captain Howdy is at first.
109* ItAmusedMe: Burke Dennings enrages Karl by calling him a Nazi strictly for the lulz.
110* JumpScare: The first time the demon's face flashes on screen might startle some viewers. And nobody could predict the vomit part, either.
111* KillTheHostBody: At the end, [[spoiler:Father Karras performs a HeroicSacrifice by inviting the demon Pazuzu into his own body to save the young Regan, before killing himself by jumping out of a window.]]
112* MedicalHorror: Regan in the operating room having a carotid angiography[[note]]an extremely painful test in which the patient must be conscious -- the doctors are played by real doctors from the medical center at NYU[[/note]] -- including the blood spurting from an artery in her neck -- was the scariest part of ''The Exorcist'' for some moviegoers at the time. No, it wasn't the cursing, the vomiting, the exorcism or anything else that caused them to actually ''leave the theaters and vomit'' - it was '''this'''.
113* TheMentor: Father Merrin in his mentor role to Father Karras. Subverted, in that [[spoiler: neither of them make it out alive]].
114* MentorOccupationalHazard: [[spoiler:Father Merrin dies. His pupil too.]]
115* MesopotamianMonstrosity: Pazuzu, the main antagonist, is a Mesopotamian demon who possesses Regan. A statue of the demon briefly appears.
116* MindHive: The demon Pazuzu appears to be one, containing the souls of the damned deceased. ("Your mother's in here with us, Karras.")[[note]]Not likely, since Karras' mother was devout and proud that her son was a priest.[[/note]] [[UnreliableExpositor Maybe]]. [[MaybeMagicMaybeMundane Even less certain in the book]]. Even with all the proof he's seen, Karras still thinks of it in terms of "manifesting personalities," until Fr. Merrin, a world-renowned exorcist, dismisses this with a flat "There is only one." And since he's evicted Pazuzu before, you can take what he says to the bank.
117%%* MindScrew: Pazuzu seems to be a fan of this trope.
118* MindYourStep: The film's climax involves a fall out of a window and a ''long'' StaircaseTumble. They filmed using a RealLife stairwell near Georgetown, which has become a tourist attraction known as the Exorcist Steps. [[spoiler: If you ever walk it, you'll [[NightmareFuel realize just how far]] Karras and Dennings fell to their deaths...]]
119* MoodMotif: It's all about the Ominous Bells here...
120* NapoleonDelusion: Karras references it, saying that claiming to be possessed by the Devil himself is like claiming to be Napoleon.
121* NextSundayAD: The movie was released in 1973 but Karras' gravestone in ''Film/TheExorcistIII'' lists his death as happening in 1975.
122* NoNameGiven: The demon that possesses Regan is never named in the film, though he was initially called "Captain Howdy" by Regan. His real name is Pazuzu.
123* ObfuscatingStupidity: Kinderman, in the books. He calls it "schmaltz". Everything he does has a purpose. Chris tells people she's "dumb" to get them to explain things to her.
124* OuijaBoard: Regan played with one prior to getting possessed. It strongly suggested that it was Pazuzu made contact with her in the first place.
125* PlaceboEffect: Subverted. Regan screams in pain when Father Karras douses her with tap water, which he claims is holy water. Later, it's implied that Pazuzu intentionally did this to fool Karras into thinking that Regan wasn't really possessed. When he douses her with ''real'' holy water in the exorcism scene, the screams are real.
126* PluckyComicRelief: Downplayed by Lt. Kinderman. He is not as overtly wacky and goofy as most uses of the trope, but his snarks and affected bumbling persona (which he uses to disarm those he questions and hide his dead-serious intent) provide what little humor the film has.
127* PoliceAreUseless: Admittedly out of his depth with the supernatural. Kellerman's investigation goes nowhere and at one point appears to suspect Karras or perhaps another priest with no real evidence.
128* PossessionLevitation: After being possessed by Pazuzu, the Mesopotamian demon, 12-year old Regan begins to float off her mattress during the exorcism conducted by Karras and Merrin. They successfully subdue her.
129* PragmaticAdaptation:
130** The film leaves out the aspect of Regan's possession from the book in which she has uncontrollable diarrhea, requiring her to wear a diaper and making her room smell unbearable.
131** The crucifix-masturbation scene is much more graphic in the book, with the possessed Regan reaching orgasm.
132** The film never mentions Pazuzu by name, most likely because it sounds silly. It's only hinted that Regan is possessed by a demon and not the Devil himself, as she claims.
133* ReCut: "The Version You've Never Seen", released in 2000.
134* ReligiousHorror: The first movie was part of a cycle of "[[CreepyChild demonic children]]" movies that started with ''Film/RosemarysBaby'' and continued with ''Film/TheOmen1976''.
135* RoaringRampageOfRevenge: The entire possession is Pazuzu's revenge on Merrin for exorcising him out of a little boy in Africa.
136* SatanicPanic: TropeCodifier. Although not about the Satanic Panic, the film's popular success spread mass hysteria and was often used in support of the panic itself after its release.
137* ScienceIsWrong: All medical treatments of Regan fail, and the doctors treating her are at a loss to explain her demonic possession with science, despite their seeming confidence.
138* SecondaryCharacterTitle: Father Merrin, the exorcist, has little screen time in the film, appearing in the first 10 minutes, then vanishing until the final act, where he meets the rest of the cast for the first time. Father Karras is the closest thing to a main character, being the only one who has an arc.
139* SilenceYouFool: A serious variation. After the demon tells Merrin to stick his cock up her ass, he firmly retorts "Be silent!" and splashes holy water on Regan.
140* SirSwearsALot: Pazuzu's got a pretty foul mouth.
141-->'''Pazuzu:''' ''(to Merrin)'' Stick your cock up her [Regan's] ass, you motherfucking worthless cocksucker.
142* SpaceWhaleAesop: Don't use a OuijaBoard, or you might suffer from DemonicPossession.
143* SplitPersonality: As the possession starts to take hold and Regan's behavior gets more bizarre, Chris thinks her daughter might have a split personality -- but see the reference to VoiceOfTheLegion, below. The doctors explain that real split personality is almost unheard of, but brain lesions and epilepsy can cause patients to act like it.[[note]]superficially, at least, if you don't know much about multiple personality. It comes on far too suddenly for the genuine article.[[/note]] When Fr. Karras begins to tell Fr. Merrin about each of the personalities he has witnessed, Merrin tersely interrupts, saying there's only one
144* StaircaseTumble: [[spoiler: Karras, fighting off his possession, throws himself out the window and down a steep outdoors staircase.]]
145* StealthSequel: WordOfGod states that ''Film/TheNinthConfiguration'' is the true sequel to ''The Exorcist''. According to Website/ThatOtherWiki, the astronaut in ''The Exorcist'' is Captain Cutshaw in ''The Ninth Configuration'', driven to a mental breakdown by what Pazuzu tells him at the party. In the book series, several unused pieces of dialogue from ''The Exorcist'' were used in ''The Ninth Configuration'' instead..
146* SubliminalSeduction: Images of a demonic face are periodically flashed throughout the film.
147* TakeMeInstead: [[spoiler:Both part of Father Karras' HeroicSuicide.]]
148* TitleDrop: From the Archbishop, while contemplating whom to call in to helm Father Karras.
149-->'''Archbishop''': What about the exorcist? Have you any ideas?
150* ThatThingIsNotMyChild: Literally, in Chris' impassioned speech to Father Karras.
151-->'''Chris''': That thing upstairs is not my daughter!
152* TransformationOfThePossessed: There's a pretty gruesome transformation when the demon Pazuzu manifests within Regan.
153* TroublingUnchildlikeBehavior: The core of the horror comes from the awful things that Regan does and says while possessed.
154* TruthInTelevision: Father Karras saying he'd have to travel back in time to the Renaissance to perform an exorcism is correct. In the modern day, actual Church-sanctioned exorcisms are incredibly rare, and even then they're only used as a last resort ''after'' mental illness has been completely ruled out.
155* UncommonTime: The opening section for Music/MikeOldfield's "Music/TubularBells" switches between 7/8 and 8/8. This opening riff is used as a soundtrack in the movie.
156* VeryLooselyBasedOnATrueStory:
157** ''The Exorcist'' was inspired by the [[https://en.wikipedia.org/wiki/Loudun_possessions witch trials of Loudon, France]] in 1634. A group of nuns were or claimed to be possessed by ''seventeen'' demons, blaming their confessor for having summoned the evil critters. All of the sexual acts, animal noises and violence were enacted by these nuns.
158** Blatty also used some of the elements of [[http://www.washingtoncitypaper.com/news/article/13017185/mr-satans-neighborhood a supposed possession and exorcism case]] in St. Louis. There have been a number of UrbanLegends around this story. [[http://www.strangemag.com/exorcistpage1.html Recently published research]] indicates the boy in that case was most likely faking for attention, and even the priests who officiated weren't sure of what they were seeing, but Blatty used the telekinesis and violence claimed by the boy's relatives. Blatty says there have been only a handful of possession cases in the U.S. that were acknowledged by the Catholic Church.
159** Pazuzu wasn't simply a name invented for the books/film. It's the name of an evil demigod/demon in ancient Mesopotamian mythology who ruled over disease, pestilence, and the heat of the midday sun.
160* VoiceOfTheLegion: Pazuzu invokes this when possessing Regan, but Merrin confirms that it's a trick and that there's only ''one'' demon inside of the girl.
161-->'''Karras:''' I think it might be helpful if I gave you some background on the different personalities Regan has manifested. So far, I'd say there seem to be three. She's convinced--\
162'''Merrin:''' ''(terse)'' There is only one.
163* VomitIndiscretionShot: The most well-known example of someone blowing chunks on screen ''ever''. Though, actually, Regan isn't regurgitating. She's spitting up loads of bile - which is worse.
164* WallCrawl: There are scenes involving the possessed girl crawling across the walls and ceilings as well, at least on the extended re-cut.
165* WhoYouGonnaCall: Is your daughter possessed by an ancient demon? Just call Father Merrin, he's experienced at driving demons out of possessed children (although a long career doing so is taking its toll on his heart).
166* WouldYouLikeToKnowHowTheyDied: The entire "[[ExorcistHead rotating head backwards]]" by possessed Regan and speaking with Burke's voice was to mock Chris for the way Burke died (the demon had snapped Burke's neck and tossed him out the window).
167-->'''Possessed Regan:''' ''(using Burke's voice)'' Do you know what she did, your cunting daughter?
168* XanatosGambit: Pazuzu tries to do this; either the priest or the girl but the priest decides to TakeAThirdOption.
169* YourMom: "'''''YOUR MOTHER SUCKS COCKS IN HELL!!!'''''"
170

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