Ima just toss out
Anime
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Bleach
Naruto
Boogiepop Phantom
.Hack\\Dusk
.Hack\\Liminality
.Hack\\Legend
Serial Experiments Lain
Paranoia Agents
Hokotu No Ken
Those are my personal faves and you should at least watch Paranoia, Boogiepop, and Serial Experiament Lain. They are all mindtrip shows and the endings will BLOW YOUR MIND!!!