I've griped about this before, because it drives me insane.
A mariachi band enters your subway car at 7am and proceeds to play exceedingly cheerful Mexican music VERY loudly, while a midget of a man walks around saying "battery battery" and sells keychains and batteries.
Another incident that had me laughing was when a man and a woman (both clearly in their 50s or beyond) got into an argument over space issues on a crowded train. The intellectual debate went like this:
Man: You stupid.
Woman: No, you stupid.
Man: YOU stupid.
Woman: YOU stupid!
Seriously, it lasted for like 10 minutes.
http://preppylife.tumblr.com/