Ichi The Killer is a classic. Over the top Yakuza/righteous vigilante movie. Its worth watching. People always go on about how violent it is, but I didn't think it was that bad. The violent scenes are well spread out, so its not like 'I Spit On Your Grave' where something 'disturbing' happens ever 5 minutes. Its not my favourate Far Eastern movie by any stretch, but its always entertaining. Its the kinda mobvie where ya think 'I haven't seen that in a while' then put it on. Kinda like Pulp Fiction.
Also, whats with that girl who speaks one line in Japanese then the next in English? Thats kinda weird.