Yo dog mind fuck movies iz where it's at. Off tha top of tha dome...
(You've prob seen these, but anyway)
Requiem For a Dream
Faust (Jan Svankmajer's one. Maybe my favourite movie ever, though I've been high every time I've watched it)
Tetsuo: Ironman (gets kind of old after a while but the first half hour or so of mind fucking is orgasmic)
Triangle (This was the last movie I saw that really wowed me. The only movie I've seen in the last 5 years or so that really had that full on effect on me)