Originally Posted by Angry Jew Cat

The obvious first recommendation is Battle Royale, but that's like the first one everyone goes too. 1-Ichi, which is kind of a prequil to Ichi the Killer, explaining how Ichi becomes the killer.Some others I really like The Neighbor #13, Visitor Q, Audition (Really creepy shit), Gozu, Old Boy (Not actually Japanese, but definitely worth watching), Suicide Circle, Noriko's Dinner Table, Tokyo Gore Police, Meatball Machine, The Machine Girl, Assault Girls...

Those are a few that pop off the top of my head, I'm sure I'm missing quite a few yet...