Recommend me some twisted anime series

Berserk. The end is really twisted :) http://myanimelist.net/anime/33/Berserk

Shigurui. Well, just watch it :) http://myanimelist.net/anime/2216/Shigurui

And the King of twisted Anime Higurashi No Naku Koro Ni http://myanimelist.net/anime/934/Higurashi_no_Naku_Koro_ni

bannie wrote: Most of the animes so far recommended are really not twisted at all except Ergo Proxy.

I was expecting a specific anime to have been listed 10000x before I got to the end of the thread.

One of the most mainstream twisted animes

SCHOOL DAYS

School Days is beyond twisted

I remember the last scene of school days it was awful and i wasn't expected that...

Noein is a good anime. The story is new and although it hasn't a lot of violence and such I label it as twisted.
http://anidb.net/perl-bin/animedb.pl?show=anime&aid=3512