One of the most beloved tropes in any form of storytelling is the classic twist ending.

Needless to say, spoiler alert.

And thenthe ending reveals that his dissociative identity disorder isnt real.

From Dusk Till Dawn

Image via Miramax/Dimension Films

He really did kill multiple people without regret and was in complete control of his actions the whole time.

Its enough to shake even the arrogant Vail right to the core.

Initially disbelieving him, Malcolm realizes one of his past clients might have had a similar ability.

Edward Norton as Aaron wearing a brown prison uniform sitting behind bars in ‘Primal Fear’

Image via Paramount Pictures

In 1930s L.A., P.I.

And that’s not even the worst of his crimes.

It turns the film froma bittersweet detective story into something out of a horror show.

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Knowing this detail makes any rewatch ofOldboya truly chilling experience.

The heightened surrealist reality isoff-putting but also humorous in several circumstances.

But its the final twist that pushes it firmly into horror movie territory.

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The detective, Sgt.

The Kims are a low-income family struggling in their day-to-day lives in their basement flat in Seoul.

Next:The 10 Most Iconic TV Plot Twists of All Time, Ranked

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Haley Joel Osment speaking to Bruce Willis in ‘The Sixth Sense’.

Image via Buena Vista Pictures

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Marta looking at Benoit Blanc monologuing in ‘Knives Out’

Image via Lionsgate Films

Knives Out movie final poster

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Jack Nicholson as Jake Gittes with a bandaged nose in sunglasses and a hat driving and smoking in Chinatown.

Image via Paramount Pictures

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Cast Placeholder Image

Cho Min-sik as Dae-su Oh holding a weapon in Oldboy.

Image via Show East

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Edward Woodward as Seargant Howie in The Wicker Man (1973)

Image Via British Lion Films

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The Gecko brothers aiming guns at the camera while a woman in a bikini stands behind them

Image via Dimension Films

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Cho Yeon-jo climbs a staircase in a scene from Parasite

Image via NEON

The poster for the film Parasite

A man collapses on a beach in grief seeing ruins of The Statue of Liberty in Planet of the Apes, 1968.

Image via 20th Century Studios

Planet of the Apes Movie Poster

Georgina Campbell’s character looking down the stairs in Barbarian

Image via Hammerstone Studios

Barbarian Movie Poster

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Movie

The Sixth Sense

Knives Out