Here, in a series of features about great endings to Hindi movies, is a look at some of the memorable last minute twists that left us, the audience, helpless, thrilled, or just plain stupefied.
Please be warned -- this is a completely spoiler-filled slideshow and will likely ruin many a climax for you. Try not to read about the films in each slide if you haven't seen them already.
That said, enjoy.

Bombai Ka Baboo
Dev Anand finds himself in a situation where a family imagines him to be their long-lost son. Anand knows the son is dead but pretends to play along, to save them from heartbreak. The ruse involves him pretending to be Suchitra Sen's brother. He does however love her, and just when all things seem like they will soon be resolved, he eventually gives up the girl.
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Khamoshi
Waheeda Rehman, playing one of the most stunning of nurses, helps a mentally deranged Rajesh Khanna back to health.
The two fall in love, yet after Khanna has completely recovered, his relieved parents marry him off somewhere else, much to Waheeda's justifiable chagrin.
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Kab? Kyoon? Aur Kahan?
Babita returns from a vacation to find that her father is dead. She soon suspects fould play, and in a violent scuffle, she ends up killing her lecherous uncle Pran.
The whole film is about Babita having killed Pran and being haunted by the guilt of her action. It's a twisty thriller where we finally learn that Pran is alive and engineered the entire plot, including his 'death.'

Jewel Thief
In one of Vijay Anand's most unforgettable thrillers, Dev Anand plays a young man caught in a doppelganger crisis. He's constantly mistaken for a lookalike jewel thief.
Every clue in the film seems to point towards Dev Anand, and just when we think things couldn't be any different, Ashok Kumar turns out to be the villain in a very well plotted tale.

Teesri Manzil
Shammi Kapoor pretends to be the owner of a mansion, and actual owner Prem Nath plays along.
Meanwhile, Asha Parekh investigates her sister's death, and the clues lead to a drummer. Eventually Shammi turns out to be the drummer!
There is much chaos till the twists continue and Prem Nath
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Mahal
The eerie film is about lawyer Ashok Kumar chasing a stunning spectre around the dilapidated mantion he lives into. Madhubala's ghost establishes a life-altering hold on Kumar, who ends up driving his wife to death.
Yet after Madhubala haunts him throughout a brilliantly lit movie, she turns out to be the gardener's daughter plotting to scare him away.

Gumnaam
A memorable retelling of the Agatha Christie classic And Then There Were None, this one features eight people trapped on an island -- with one of them getting murdered every day.
Suspicion is rife and everyone on the island hunts for clues, but in the end the evil professor was the one plotting every move -- even though everyone believed he was dead rather early on.
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In this ambitious film, Sir Rex Harrison plays an old cripple assembling a bunch of master criminals together to find a successor.
Eventually, they realise that Harrison isn't anywhere near as helpless as he seems, and has set the whole scam in place just to kill his rivals.
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Vaastav
The gritty gangster drama provides a superb backdrop for a deeply disturbing character study highlighting Sanjay Dutt's rise to notoriety.
In the final reckoning, we're all stunned by the way his mother Reema Lagoo puts a gun to her son's head.
Gangster
Throughout the film Emraan Hashmi seems like a wimpy singer given to much mush.
But after wanted man Shiney Ahuja is turned in to the police, he turns out to be a cop expertly playing Kangana, the gangster's moll.

Johhny Gaddaar
In this film about a simple heist made to go wrong, the protagonist coolly kills all his partners in his attempt to hide his theft.
Yet who was to know that the guy dying in a florid jacket during the opening credits would be leading man Neil Nitin Mukesh, the compulsive villain meeting an appropriately abrupt end?
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