Here are some of mine:
EW.com's 22 MOVIES WITH BIG TWIST ENDINGS:
Seven (1997)
The Sixth Sense (1999)
Fight Club (1999)
Les Diaboliques (1955)
Memento (2000)
Psycho (1960)
The Usual Suspects (1995)
Planet of the Apes (1968)
Identity (2003)
The Prestige (2006)
The Game (1997)
Phone Booth (2002)
Donnie Darko (2001)
Soylent Green (1973)
Mulholland Dr. (2001)
The Empire Strikes Back (1980)
Old Boy (2003)
Kill Bill, Vol. 1 (2003)
12 Monkeys (1995)
Eastern Promises (2007)
The Others (2001)
Angelheart (1987)