Best Thing Seen Today
It's a tie:
1) A bunch of people lined up along the fence at the baseball diamond in the waterfront park, rapt before a dramatic game being played by local Little League teams. The impromptu audience was clearly made up of people not planning to be there -- runners, dog-walkers, etc, and the players were little Little-Leaguers.

2) A man getting on the subway in full pimp-regalia. I'm talking, white suit with tails, wide-brimmed hat, gold-tipped cane and everything. Now, this man may not have actually been a pimp, but from his demeanor, I have no doubt that he was not wearing those threads ironically.