There was a funny-ish video made by a few professional photographers (I believe with connections to National Geographic) about approaching strangers. As I recall it was posted on a website that they had recently started and that was set up to provid tips and techniques.
In one scene a "stranger" pretends to shoot the photographer. I don't tend to find gun violence funny, but I found this short video useful as a way of breaking the ice on approaching potential subjects and ethics. Does anyone remember seeing this? It would have been sometime this year. I'd like some young budding photographers to view it but my efforts to track it down through youtube, google and google video have been ineffective so far. Thanks!