Sean Penn Mean Man Walking

10/18/2007 9:30 AM PDT

Sean Penn -- Mean Man Walking

Surprise, surprise, Sean Penn doesn't love the paparazzi.

The wacked out director of "Into the Wild" had some kind words for one of our photogs last night -- yelling, "Go f**k yourself!" after being wished a good night.

Whatever happened to the lovable Jeff Spicoli?!