Personally I'm still waiting for someone in a jacked up SUV etc. to roll that thing trying to pass me at 35mph on a tight turn safe at no more than 20mph. They lean soooo far over I become scared for their safety more than my own.
I remember having someone tailing me around a steep downhill curve when I was probably only 14. I know I was going way to fast for my skill level, and having a car two feet off my tail made me afraid to slow down. I came within inches of hurtling off the outside curve of the road and down a twenty foot embankment. On the bright side, that incident may have been a catalyst for my present biking habits as I am very stubborn and will always do what those whom I do not respect find annoying.