Sorry if it's already been posted, but this video shows just how fast things can happen out there...
http://www.videovat.com/videos/1192/motorcycle-crash-helmet-cam.aspx
definitely a classic. That particular video has even made it onto syndicated news. It is a great example of...
1. how quickly conditions can change out there
2. what good gear can do for you in a crash
3. how stupid the other guy can be behind the wheel