Not exactly the ending, but I saw the Matrix opening week in 1999 after seeing Larry Fishburn's trailer. I had no idea what to expect....But people living in cyberspace was not it. Still one of my favorite flicks of all time!
The Village and Unbreakable's ending were pretty good twists.
Also "No Way Out" with Kevin Costner...Although Ken Ober from remote control ruined the ending for me by blurting it out on TV before I saw it!
Empire Strikes Back - COme on...Vader Luke's father...No way!!