Elfen Lied Possibly the most disturbing anime of all time!
Seriously watch just the first episode and you will realize what I mean exactly. The series will literally leave you with one of the stupidest endings, so i would suggest reading it. You will feel emotions from in the begging to the end in mostly the following order:
O.O wtf?! chick kills people
-_- hmm very interesting
>.< omg! Where did that come from..
………. Repeat through…..over….and over….and over…..and over…