Oooh, the memories! Thirty years ago in Cambridge (in the UK, not the US) I saw a man I knew, dressed in white flannels, and a striped blazer, and a boater - I think he was working as a punt guide on the river, and the tourists liked to see the guides dressed 1930s style. He was on the other side of the road, but he saw me and lifted his hat, and I bowed to him, and the tourists squeaked at both of us!
I do remember being so flattered, out of all proportion to the event!