New York's iconic Grand Central Station

No one wants to stick out like a sore thumb while on vacation; after all, these days "tourist" can almost sound like a curse word -- especially the way New Yorkers say it.

One place that makes it particularly (painfully) clear who is a local, and who is not, is on New York City's subway system. Even if you think you're acting nonchalant, chances are that you're not -- especially if you're doing these seven things we've outlined in the video below.

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