Subway, New York City
New York is a working City, rather than a place designed for tourists, you may find people rude when they are only in a hurry. Avoid rush hour, and ask questions in as succinct a manner as possible. the answer may be short but the info will be good.
If anyone tries to sell you a swipe at the sub-way turnstile, simply say no thank you. They are just trying to get your money. This is illegal. Decline, and move along.
In NYC, most people on the street or subway are walking so fast, everybody looks like they are SO BUSY... So, fast your steps, stay out of others' way!:P