Riding the New York subway makes you pay a lot more attention to them; there are people everywhere, but you're not supposed to make eye contact, so you stare up at the ads or down at people's shoes.
Two people next to me this morning on the F: First guy -- light blue dress shirt with the white corporate collar and tie, blue pinstriped dress pants, and flip-flops. Second guy -- relaxed in black t-shirt and jeans, but wearing white Nike sneakers with pink lace and pink swoosh. I envy him, though. He just looked not-that-great wearing those mid-80s Madonna fan shoes, whereas I would have looked awful.