Hmm, I'm away from home at the moment with work, so I've not completed posting for that week in full yet, however, I think this one for me is going to win hands down!
My shot came from me learning a lot about how to take street candids...
The younger guy, a 16 year old French student I didn't even speak too directly, realised I wanted to take shots and silently worked with me to get expressions out of the older guy.