Well Samurai 7 made me feel really sad..a lot of great and likable characters died pretty horribly.
Higurashi No Naku Koro Ni & Higurashi No Naku Koro Ni Kai ..I stopped trusting little girls with knives. The entire show took me to a place I really didn't want to go. Season one left me in a fetal position in the corner of my room. Season two convinced me that everyone was out to get me.
Tengen Toppa left me blown away by the "epicness". And of course I'm left with the feeling to "fight the power".
Zegapain left me wondering if the Matrix was actually real.
Black Lagoon convinced me that the world is indeed full of some very very bad people.
Elfin Lied taught me that there is indeed a limit to how much a person's life can suck before he/she snaps.