Was gonna include Cemetary Man on my list - part wacky zombie movie, part mind-****
Great movie.
Identity, Fight Club, Hidden Window and Haute Tension all seemed to play with that schizo disorder/twin personality thing that became very tired.
Charlie Kauffman stuff I tend to find smug and wrapped up in how clever he thinks he is, though I enjoyed Being John Malkovitch.
Audition certainly fits the bill, as do most other Miike movies.
Loved Cube, haven't managed to catch Splice yet.
A couple more real Japanese head-shredders -
Uzumaki (spiral)
Suicide Circle