The most surprising plot twist or ending
I think this question is just asking for spoiler anger. So if you're one of the three people that hasn't read The Hunger Games yet, then read no further.
The Hunger Games was full of twists and turns, but I think my favorite was Peeta announcing he was in love with Katniss on national television. It's the kind of moment where I rub my hands together and think, "Now we're getting somewhere."
What about you? Do you know of a good book with a great twist or surprise ending?