It is therefore without prejudice or snobbery that I can say you are not a New Yorker yet when:
Upon exiting a subway station, you stop and stand at the top of the stairs and look confused. The chances are that a New Yorker might be confused too as it is almost impossible (despite the signage, which I believe to be a fallacy) to know which way is north or south unless you've been there before. .. but New Yorkers don't block the exit for everyone else in the process. They just start walking in a random direction and work it out from there.
You insist in paying cash in restaurants. I can't think of a single good reason why this makes sense and I also find it a little annoying as it means having to work out the tip in advance for the person(s) paying in cash, rather than just conveniently calculating it from the tax on the credit card receipt.
When asked for an address, you say "2350 Broadway" or "1330 6th Avenue", which means absolutely nothing to anyone. New Yorkers never, ever, use street addresses and always reference the cross streets and avenues to direct people.
You walk at a normal pace, or even worse, stroll along the streets instead of the competitive speed walking that New Yorkers practice on a daily basis. I have to admit that it is a particular pet peeve of mine as, despite my rather short stature, I can walk faster than most grown men I know.
You don't let women go before you through open doors and in elevators. This rather old-fashioned form of chivalry seems to have been imprinted for life in the psyche of New York men and while I am all for equal rights, it is rather endearing.
You suffer a mild panic attack when your New Yorker friend crosses the street just as the red hand flashes and sometimes even forcibly try to stop them. The flashing hand means you get at least another 30 seconds to cross the street before getting run over. If it takes you anything over that time to cross the street, then it is the City's own natural selection of the fittest process as far as I'm concerned!
You think that brunch is a meal that takes places sometime after breakfast and before lunch, around 11.30am. Which couldn't be more wrong - New Yorkers will never be caught dead having brunch earlier than 1.30pm or 2pm.
You genuinely hold hope that you are going to find a public toilet anytime now when roaming around town. As far as I'm aware, they are simply nonexistent in the City apart from the extremely clean and pleasant one at Bryant Park. But then that's what Starbucks is for.