A couple taking part in the 10th Annual No Pants Subway Ride walk through the hallway of the Union Square subway station in New York City Jan 9, 2011. The event, organised by Improv Everywhere, involves participants who strip down to their underwear as they go about their normal routine. [Photo/Agencies]

A man talks on his cell phone after taking part in the 10th Annual No Pants Subway Ride in New York City Jan 9, 2011. [Photo/Agencies]