Odd sight the other day at the bank in my neighborhood:

I'm at the main counter and I see a familiar guy walk in to use the ATM and our eyes meet, and then I recognize that it's the city's police chief, who lives in my neighborhood and who I've never actually met but who I still recognized anyways, and I think to myself for a second after he goes to use the ATM that I should have waved in a friendly way or something at him, since I at least knew for my part who he was.