Watch out for me! http://www.reason.com/blog/show/127041.html

Washington Post Department of Human Behavior correspondent Shankar Vendantam reports drivers who decorate their cars with bumper stickers tend to be more aggressive than those who choose not to pithily share their political, environmental, and religious views with their fellow motorists.

I'll post a picture of my car when I get time. It's fairly plastered.
  ¶ 11:16 AM