The UK's Times Online named their choices for Best Film Twists Ever.
"The most powerful tool in cinema is the perfect twist, those vertiginous seconds when the bottom falls out of your seat and you are no longer sure whether to trust your eyes."
The films mentioned are:
Great Expectations
The Empire Strikes Back
Rosemary's Baby
The Wicker Man
The Cabinet of Dr Caligari
Fight Club
Planet of the Apes
The Sixth Sense
The Crying Game
Rebecca
Blade Runner
The Shining
The Usual Suspects
The Prestige
The Others
Jacob's Ladder
Dead Man's Shoes
Sunset Boulevard
Vertigo
Psycho
Dr. Strangelove
Kiss Me Deadly
The article itself is FULL of spoilers, so click at your own risk
here.
A couple of movies that weren't big box office but that I thought had really good twists are
Arlington Road starring Jeff Bridges and
Fallen starring Denzel Washington.
Anybody else have a nominee or two for best film twists ever?