From Tobe Hooper’sThe Texas Chain Saw Massacreto John Carpenter’sHalloweento Ridley Scott’sAlien, there are a number of iconic titles that pop up whenever horror movie buffs debate the genre’s greatest entries. But the groundbreaking masterpiece that still levitates above all of them is William Friedkin’sThe Exorcist. Arguably no movie is more frequently praised as the most terrifying horror film ever made.

On its initial release in 1973,The Exorcistwas a cultural landmark. With a worldwide gross of over $400 million, it became the most successful movie in Warner Bros.’ history and by far the highest-grossing horror film of all time (a record it held untilthe release ofItin 2017). Moviegoers fainted in the middle of screenings, some theaters reportedly issued “Exorcistbarf bags” to contain viewers’ inevitable nausea, and some even sold tickets to watch the audience watchThe Exorcistat sold-out shows.

Regan hovers over the bed in The Exorcist

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Very few movies have caused this kind of phenomenon.The Exorcistwas a bona fide blockbuster years beforeJawsandStar Warswould turn high-concept genre movies into Hollywood’s most bankable cinematic currency.

Does The Exorcist Hold Up By Today’s Standards?

In 1973, audiences hadn’t seen anything likeThe Exorcist. Some viewers suffered serious psychological consequences after watching it. The Devil had never been depicted in such a hauntingly realistic way before. Of course, afterThe Exorcistbecame a box office sensation, demonic possession was quickly turned intoa horror subgenre of its own.

Hollywood classics can sometimes fail to hold up after decades have chipped away at the attention spans of audiences, especially when a given movie has inspired a slew of parodies and rip-offs. But despite being spoofed in everything fromScary Movie 2toAustin PowerstoThis is the End, and ripped off in every horror movie with “exorcism,” “possession,” or “Devil” in the title,The Exorcistdoesn’t have this problem. After nearly half a century, Friedkin’s movie remainsa perfectly crafted horror gem.

Father Merrin sees a statue of Pazuzu in the opening scene of The Exorcist

Like most movies from the ‘70s,The Exorcisttakes a while to get going by today’s standards. It opens at an archeological dig in Iraq and takes its time introducing Chris MacNeil’s life as a working actor in Georgetown before her 12-year-old daughter Regan begins to show signs of demonic possession. But these terror-free opening scenes are far from boring, because Friedkin starts building to the terror from the offset.

There’s A Sense Of Dread From The Beginning

Since the past few decades of horror movies have numbed audiences to the usual tropes and techniques, modern horror films waste no time diving into the scares. Ari Aster’sHereditary, dubbed “this generation’sThe Exorcist” by some critics, hasthe accidental decapitation of a childwithin its first half-hour. But Friedkin usesThe Exorcist’s slower pacing to terrific effect.

Fleshing out the MacNeils’ home life before it’s intruded bythe demon Pazuzuis a great way to endear audiences to the mother and daughter ahead of the terrible things that are about to happen to them. And on top of that, while viewers are getting to know Chris and Regan, Friedkin instantly establishes that those terrible things are on their way, creating an overriding sense of dread from the very beginning.

Fathers Merrin and Karras begin the exorcism in The Exorcist

In the Iraq-set opening scene, veteran Catholic priest Father Lankester Merrin looks up to see a statue of Pazuzu looming over him. This acts as an ominous premonition of things to come. As Regan’s behavior becomes increasingly erratic and inexplicable – and intensive medical tests find nothing wrong with her – it’s clear to the audience (and, eventually, to Chris) that the only thing that can save her is the intervention of a couple of daring priests.

Friedkin Pays Off The Dread Spectacularly

It’s easy to build up a sense of dread in the first half of a horror movie. All the filmmaker has to do is promise the audience that the protagonists are doomed and horrible things are about to happen. The tricky part is paying off that dread in the second half. InThe Exorcist,Friedkin pulls this off spectacularlywith shockingly authentic depictions of the horrific scenarios described in William Peter Blatty’s source novel.

Moments like a possessed Regan spider-walking down the stairs, stabbing herself in a very sensitive area with a crucifix, and spinning her head around 360 degrees are still haunting today. The movie’s final half-hour, in which Fathers Merrin and Karras arrive to exorcize the demon, is a relentless barrage of terror. Regan hovers above the bed, Pazuzu taunts the priests with the traumas it senses within them, and finally, Karras invites the demon to possess his own body instead and launches himself through the window and down a tall set of stone steps to defeat Pazuzu once and for all. No matter how many comedies lampoonThe Exorcist’s “The power of Christ compels you” scene, it’ll always be genuinely unsettling in the movie itself.

Horror fans accustomed tothe genre’s faster-paced modern outputmight findThe Exorcistto be a dull, slow-moving experience in its opening scenes. But stick with it, because the payoffs later down the line are well worth the wait – and much more terrifying than the majority of today’s horror fare.