Unexpected Turns

I love it when a story takes an unexpected turn. Oh, not my story. Goodness knows mine plunge over the cliff about ninety percent of the time. And it's anybody's guess where they'll end up. 
But I do love it when some other author pulls off that surprise, when it's a sucker punch I never saw coming. Have you ever read a book or seen a movie that caught you flat-footed...you know where you had to go back to look for the clues you missed?
No Way Out was a movie like that. I remember the first time I watched it my jaw just dropped at the end. Then I had to watch it again to see exactly what I missed. It was pretty slick.
I also love a particular one of Linda Howard's books that has the best all-time surprise ending. I smile every time I think about it.
What about you? Do you like really startling surprises and twists in your books? Or would you rather be able to figure out how it's going to end?
anny