Towers in the Mist
When two tall strangers, usually in a country with where people are shorter, see each other across a crowded area and feel compelled to acknowledge each other like two towers in the mist.
Walking in the crowded streets of Hong Kong, I was always head and shoulders above everyone else on the street except for another westerner across the street. We acknowledged each other and the silly situation with a head nod, much like towers in the mist.