(DOCUMENTARY) You will never understand the shit that philosopher Slavoj Zizek is on. But after a few minutes of watching this documentary by Astra Taylor, you'll completely understand why he's famous and has so many admirers all over the world. Zizek is a very funny man. He knows how to crack up his audiences and the few readers who can penetrate his difficult books. Most philosophers laugh with their minds; Zizek laughs with his belly. (Northwest Film Forum, 1515 12th Ave, 267-5380. 7:15 and 9 pm, $8/$5 members.) CHARLES MUDEDE