Edit: alright, people wanted more details on the story...
We paid for that parking spot. Driving home, the Hummer 2 was on the road right in front of me. As I was about to park into my PAID spot, he parked into it. He couldn't have not known that the spot was restricted, since there was a sign right in front of it that says "permit required" and that specific space outline was painted differently, yet he parked there anyway. Normally I'd talk to the driver first, but I didn't want to have to deal with this the hard way so I waited for him to leave, then the rest was what happened in the video.

20 minutes or so after the whole thing was done, I could see the driver pacing back and forth, flinging his arms, frustrated and shouting something unintelligible because I was pretty far away. After that I could hear him still shouting and now even banging on something metallic through my window. He walked halfway toward a house with the garage opened, presumably the house he stayed at during the whole thing. Then halfway there he turned around back to the parking spot, once again cursing. At that point I closed the window and watched TV.

There's a link to a higher quality version at the end of this movie. The quality isn't that good to begin with because I was using a Casio Exilim Z50, not a camcorder.