The art of "Showtime" is a highly-contentious subject here in New York City. Most tourists and visitors like to see it, most locals loathe it. Regardless of how you feel on the subject, it's best to leave the acrobatic subway moves to the ones who are actually able to perform them, rather than try them yourself.
Subway Etiquette Tip #134: Leave "Showtime" to the professionals.
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