First, I was heading to school for a lunch meeting with my advisor. I got on the train and promptly passed out. I woke up somewhere around 180th Street with drool all over my face - and realized that it's the first time I've felt comfortable enough on the New York subway to actually fall asleep, no matter how tired I was.
Second, heading home from school, an eight-piece band played music on the sidewalk as children in fancy dress showed off their dance steps. I have no idea what they were celebrating, but the crowd was clapping, heckling, and generally appreciating the strange and wonderful things that happen when you put this many people into this small a space.
Speaking of which, I've got an idea for a truly creepy short story on the latter topic, but that's for another time (when I have less academic writing that I ought to be doing!).