He pretends to be a street performer.
As soon as he finished singing "Twinkle, Twinkle Little Star", while strumming the guitar, he told me to put money "in the case". I tossed in a quarter. He promptly said, "More please." I rewarded good manners with another quarter.
I have since collected two forgotten quarters off the floor.
As they say:
You can take a kid out of the city. But you can never take the city out of a kid.