Well, living in NYC and riding the subways daily I have a laundry list of stories/scams I could tell you, when you ride the same train at the same time you usually run into the same people.
The latest scam appears to be a group of Romanians who ride the subway, always a girl with a baby strapped to her holding up a sign begging for money, funny thing is although it's always a different girl, the cardboard sign they hold up is written perfectly, nice block letters, similar to what cue cards looks like, how does that happen when apparently you have no money for food or shelter but the signs are so perfectly written and they're all similar? Also, some of them ride the trains and play an accordion (a guy), while usually it's a little boy that goes from passenger to passenger with the hat, and sometimes there's a woman there also, with the kid strapped on her plus the kid and the accordion, must be a family affair..