Because I've been thinking (ohgod) about it recently, and I wave and say hello to like, 10 strangers on average every day.
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0 I'm the one walking down the sidewalk with my head down while passing a stranger, just to avoid eye contact. If someone smiles and says hi to me.. I'll smile back but rarely will I say hi or engage in some random conversation with a stranger on the streets. Neighbors, I don't know or have never talked to, waving? I'll wave. Put me at a concert or something and it's a different story.