Coming up the stairs from Davis, I was taking them two at a time, as I often do: tilted forward in a Groucho posture, bringing my knees up almost to my chin with each step. It's an unlikely gait, but it sure covers the elevation. I glanced across the railing to the other side, and saw a young black guy doing exactly the same thing, matching me step for step. Shaved head, gray hoodie, little oval glasses. And I saw him glance over at me at the same moment, and realize at the same moment what we were both doing, and grin the same half-embarrassed sidelong grin at me that I did at him. He gave me a little chin-bob, a little hatless tip of the hat. I nodded back, laughing.
At the top of the stairs, in a half-second of hesitation amidst the flow of passengers, we both started to say something, then thought better of it. We chuckled instead, and shook our heads a little, and passed each other, heading off in our opposite directions.