Not a book or a movie but I used to love to watch "The Twilight Zone" many episodes of which had great plot twists and blow your mind endings. My favorite episode with a surprise ending is probably "To Serve Man."

This comment is just to push me over the line to level 5 ;-p

Philip Pullman, His Dark Materials trilogy

Megan Whalen Turner, The Queen of Attolia
(this is the 2nd book of Turner's series that has been unofficially dubbed, The Queen's Thief. The first book, The Thief, is great, but The Queen of Attolia is even better, complete with mind-blowing ending)

my favorite mind-bending movies are interstellar, contact, arrival, Mr. Nobody and cloud atlas I think.

Pet Cemetary

How about "Never Let Me Go"?

“In the Realm of the Senses”
written and directed by Nagisa Oshima.

A sexual and psychological nogginthumpt film.

"The Fifth Head of Cerberus" by Gene Wolfe is three novellas and, while not exactly a twist ending, I'd say the entire story is a giant mind fuck.

cloud atlas was an all around mind fuk

Most recently, Get Out, and The Others. Will think of more later.

Eternal Sunshine is one of my favorite movies

interstellar for sure

The Butterfly Effect messed with my head a bit.

Contagion. The end was the beginning with a simple habit many of us fail to complete regularly.
I also liked V for Vendetta and The Happening; plants are the best!

Gone Girl is a mind blower.

UPDATE: Just watched Donnie Darko.. Hell of a plot twist.

Mindwalk
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The Others
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The Village
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I like Tell Me Your Dreans by Sydney Sheldon.

Predestination is hawt.

Meet mr. Black.
Death falls in love, girl gets brad pit in the end.

The chase
The guy gives up and falls through the glass . He come to and every pne congratulating him.

Prestige

The Fourth Kind. Got me into Sumerian history - a trip that is still going.

the long kiss goodnight has an amazing twist to it

dusk till dawn mind fucks you right in the middle

There is one many years ago for which I can't remember the title. Young man's father dies and in his father's stuff is this name and address(?don't remember). He realizes an attraction for this woman whom he meets through having this information, and spends a lot of time with her. When information comes to her as to why he is seeing her, she immediately breaks off contact. The surprise comes at the end when he sees a home movie his father took and all the pieces come together. You see his father's infidelity had been discovered by his mother and the father had promised to break off contact with his mistress. Anyone out there that can tell me the title, please do. I want to have that one in my "library".

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But a fiction movie that blew my mind...
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