I'm really reluctant to talk to strangers, but when I do... I use triangulation, where you don't talk about yourself (a stranger doesn't care) and you don't talk about them (it makes them uncomfortable), but instead you talk about a 3rd subject that maybe is visible to both of you, like the pretty fall leaves.

Actually, last year, right after I learned about triangulation, I was walking my dogs and stranger mentioned the pretty fall leaves to me. I then started telling him that he was using triangulation and explained what it is. He got uncomfortable and walked away. Derp.