http://www.youtube.com/watch?v=KRgiIrHRoHM
http://davesbikeblog.squarespace.com/blog/2011/2/27/critical-mass-horror-in-brazil.html
http://www.sfcriticalmass.org/2011/02/28/update-motorist-in-brazil-cm-attack-turns-self-in/
Horrible. 
The youtube comments are quite crass as well, although that is to be expected.
What isn’t to be expected is what occurred in the video. Shocking and horrible, the man who drove the car deserves some kind of horrible punishment which more than likely will not be doled out.