Rice schmice. I don't go for the fart cans, or big wings, I find them annoying. But to each whatever they can own. Like Tom said it can be a 'phase' they might be going though (plenty of people have done scary things to BMW's too ya know). Or, it could be a result of a seizure... But really, just ignore them, or stomp the gas and go write a post in the kill forum if ya feel the need. Hey sometimes, the floorboard and your pedal have to meet, ya know?
As for the 'driving maneuvers' a few of you guys have mentioned, I see more people in SUV's and mini vans trying to be the next Dale Earnhart Jr, than I actually see the guys in the jazzed imports being silly.