This thread needs more Higurashi (no naku koro ni).
Seriously, it's a murder mystery. With 6 arcs. The first 3 'question arcs' show the events happening differently, but similar outcomes, confusing you more, adding more characters, then the second 3 (the 'answer') arcs explain the three arcs.
I can't really explain how amazing it is, just get hold of it. (the anime that is, the manga was only partially translated, and the visual novel partially done too, while the anime is 100% subbed)
Or atleast look up the plot online (without spoilers, else you will kill yourself).
But it's got the best, biggest twists in anything I've ever seen. I spent weeks and weeks agonising over what would happen, and basically all the predictions were wrong :<