Last night on my commute I witnessed an accident between a cyclist and a van. Everyone was very nice and very scared and we all didn't really know how to proceed. The girl on the bike was very shaken up, then man in the van looked afraid for his job.
In talking about the incident later, I was brought to realize that I should have called the police, just to file an incident report. That intersection would have a history and the cyclist would have recourse for a new fork (or bike).
Lesson learned - even if you don't want to press charges, just always plan to call the authorities.