What’s Their Story?

I wonder what their story is. Many times now I have observed people on the streets during my bus ride to work and my imagination start to picture what their story is about. At one stage I was thinking it may be a good idea to snap a picture of them and write about what I think their story is. And it may be interesting for them to somehow stumble upon the post about themselves and tries to compare facts vs imagination. But taking a photo of someone without then knowing it would be rude (and maybe wrong?).  Only if I'm a good artist, I can draw them instead!