Strangers never interact with me for some reason. Or if they do it's never really been unpleasant even if it was a bit awkward :P
Though being 6'5 with a big build and the looks of a serial rapist might be the reason.
I'm sure I might be forgetting something but in all seriousness I dont think I've ever had a stranger act unpleasantly towards me.
Then again I live in Finland... the land of dont-interact-with-strangers-ever.