It sure makes em easy to spot! And don't forget the giant paper mache effigies...the loony left loves to make those. I've never figured out why but if you go to a WTO-type protest ANYWHERE in the world there are guaranteed to be giant paper mache heads of Bush, Blair, Koizumi, and Berlusconi. It's almost like they have a list of protest materials out there that no protester can be without, including among other items a paper mache effigy. Or maybe its just the same guy who keeps showing up over and over again.
Shawn Hannity interviewed some of those protesters and half of them didn't know why they were protesting. Its called rent-a-mob.