Prince of Tennis...It has been 発言しました that the story holds some surprising twists to the regular sports drama formula, and praised the suspenseful matches and innovative techniques.
Persona 4 The Animation: A funny mystery and there is no way あなた will ever guess who is responsible for the mystery. The ending 'bad' guy was so far out there, such a ランダム person there was no predicting it! Very cool アニメ and recommend watching the english dub version because the voice actors did great job. Oh and this originally was a game
Eden of the East: Keeps あなた always guessing and trying to figure out what is going on. I couldn't have guessed the ending. Also recommend watching the english dub version.
Another: This is a horror one that I really liked. Not much into horror アニメ but this one was good! I couldn't have guessed what was going to happen.
K-Project: Once again I didn't predict the outcome in this either. Hard to explain this one though other than it was a good.
___________________________________ Now comes the hard part of picking which one to do a 写真 of... I'll do Persona just because the ending was so far in left field, the most ランダム person
Dangan Ronpa: The animation. the story from the beginning was quite predictable (murder, investigation, school trial) but when the last murder occured suddenly everything went upside down and the so called mastermind shows up. That was a suprising twist but very interesting nevertheless!