What is your favorite movie with a twist ending?

Body Heat.

Romeo Is Bleeding. Lena Olin is the perfect fatal-s.o.b. woman in this movie.

Sixth Sense.

Same here "The Sixth Sense"

Any of the Rocky movies. Just kidding!

No Way Out

To add to the great ones already named:

The sequel to Jean de Florette (which must be seen as it sets everything up) called Manon of the Spring.

Sixth sense or The Others or Saw.

The Empire Strikes Back

Fight Club!

the director of THE SIXTH SENSE repeated himself too often, as he also did that same type of surprise ending in movies like "Unbreakable", "Signs" and "The village".

Other good movies with surprise ending: Mad detective (hong kong movie from 2007: http://www.imdb.com/title/tt0969269/ )

Profondo Rosso (Deep Red) by Dario Argento.

The Flintstones in Las Vegas

How about "The Crying Game?"

Mulholland Drive

Mulholland Drive i could not understand it

The Pirates Who Don't Do Anything: A VeggieTales Movie

Triumph of the Will. (spoiler: hitler dies!)

seven

sixth sense for sure!

A Tale of Two Sisters

Korean movies Brotherhood and Silmido

Primer

this will twist your noodle http://www.youtube.com/watch?v=4CC60HJvZRE

"The Empire Strikes Back"

Har!

How about "The Game"?

"The Flintstones in Las Vegas"

Har!

How about "A Fish Called Wanda"?

"Saw"

Which one?

The Usual Suspects

The Planet of the Apes. (Original)

Old Boy, The Mist and my last one, The Prestige.

Evil Dead 3.

a very light one, like Dirty Rotten Scoundrels

Jacob's Ladder, Black Christmas, Soylent Green, The Omega Man

Old Boy

Old Boy!! Total Recall.

"The Sound of Music: The Director's Cut"

Boy, I didn't see that coming... :(

Usual Suspects

2001: A Space Odyssey.

How about the end to Beat Takeshi's "Zatoichi"? The head of the criminal gang was not who you expected, AND Riverdance turned out to be Japanese!

Or maybe it was "The Love Guru": The unexpected twist is that it was supposed to be a comedy.

Pulp Fiction, with John Travolta and Uma Thurman dancing the Twist.

For me:

Totoro. That sandal scene gets me every time. Mei lives!

Yay トトロ！ Beautiful movie and I hope my daughter remebers the times we saw it together when I pass on.

Zatoichi was a good one. I also didn't see the ending of the Fight Club coming at all- quite rare for a Hollywood movie.

Freeway II: Confessions Of A Trick Baby

Not really a twist, but I enjoy watching Trans-Sexual Paedophile Witches getting pistol whipped and baked in an oven.

Call it a fetish.

Memento (director Christopher Nolan, who also did The Prestige which Yongyang mentioned). Guy Pierce in the lead role ... a great film!

For movies it is difficult, but for literature it is pretty much everything I read on JT. :P

Don't forget about The Maltese Falcon or Casablanca. For more modern flicks, The Usual Suspects. I actually shuddered.

Departed, The Mist, Gran Torino, Casino, God Father (Marlon Brando character died of natural cause), Avatar (Sully died & reincarnated),Matrix 3 the ending, Star Wars (Luke's father & Darth Vader passing away), Batman Dark Knight, and many more.

Seven

Holiday On The buses.

Shawshank Redemption Not so much of a surprise ending, just had to see the movie again after seeing the second half - and saw it all in a completely different light.

Brainiac: "The Crying Game" is a great choice, but I'm going to keep that as number 2 and stick with Titanic.

The Shining and A Perfect Getaway.