Passengers without pants wait on a underground platform during the “No Pants Subway Ride” in Kiev January 12, 2014. The event is an annual flash mob and occurs in different cities around the world in January, according to its organizers. (Photo by Gleb Garanich/Reuters)

Participants inf the No Pants Subway Ride wait for a train in Berlin. (Photo by Adam Berry/Getty Images)

Participants begin to shed their pants for the No Pants Subway Ride at the Civic Center station of MARTA in Atlanta. (Photo by Curtis Compton/Atlanta Journal-Constitution)

People take part in the No Trousers Tube Ride event next to other passengers on an underground train passing through London. (Photo by Matt Dunham/Associated Press)

A subway passenger looks at participants of the No Pants Subway Ride in Berlin. (Photo by Adam Berry/Getty Images)

A woman holds a sign that reads: “Excuse me to have too much dignity, no to the public Brussels transport in underwear”, as participants around her take part in the No Pants Metro Ride in Brussels. (Photo by Yves Logghe/Associated Press)

A participant in the No Pants Subway Ride waits for a train in Berlin. (Photo by Adam Berry/Getty Images)

A participant in the No Pants Subway Ride looks at a subway map while riding a train in Berlin. (Photo by Adam Berry/Getty Images)

Passengers participate in the No Pants Subway Ride in Mexico City. (Photo by Marco Ugarte/Associated Press)

Leah Estreicher and Marianne Cornejo start to get dressed at the Union Square subway station after participating in the annual No Pants Subway Ride in New York. (Photo by Craig Ruttle/Associated Press)

Participants travel on the train without their pants during the 5th annual No Pants Subway Ride in Madrid. (Photo by Andres Kudacki/Associated Press)

People stand aboard a departing subway train in New York. (Photo by Craig Ruttle/Associated Press)

Some riders enter the New York subway in their underwear as they take part in the 2014 No Pants Subway Ride on January 12, 2014. (Photo by Timothy Clary/AFP Photo)

Indian commuters, stripped to their underpants, participate in a No Pants Subway Ride on the metro in Bangalore on January 12, 2014. The No Pants Subway Ride is an annual event staged across major cities of the World every January. The mission started as a small prank with seven guys and has grown into an international celebration of silliness, with dozens of cities around the world participating each year. The idea behind No Pants is simple – random passengers board a subway car at separate stops in the middle of winter without pants. (Photo by AFP Photo)

People taking part in the “No Pants Subway Ride” wait at a metro station in Buenos Aires on January 12, 2014. (Photo by Alejandro Pagni/AFP Photo)

People taking part in the “No Pants Subway Ride” are seen on the U2 Subway line in Berlin on January 12, 2014. (Photo by Odd Andersen/AFP Photo)

People take part in a 'No Pants Subway Ride' event in Beijing on January 12, 2014. Commuters in Hong Kong and Beijing braved public transport without trousers in the stunt, also celebrated in Australia's major cities, which has gone global since its first staging by the US group Improv Everywhere in New York in 2002. (Photo by Wang Zhao/AFP Photo)

Police look on as riders wait for a train in the New York subway in their underwear as they take part in the 2014 No Pants Subway Ride on January 12, 2014. (Photo by Timothy Clary/AFP Photo)

A passenger stands in between participants as they wait for the train without their pants during the 5th annual “No Pants Subway Ride” in Madrid, Spain, Sunday, January 12, 2014. (Photo by Andres Kudacki/AP Photo)

People taking part in the “No Pants Subway Ride” stand on the platform at the Potsdamer Platz station on the U2 Subway line in Berlin on January 12, 2014. (Photo by Odd Andersen/AFP Photo)

Commuters participate in the annual event, No Pants Subway Ride, in Mexico City, Sunday, January 12, 2014. (Photo by Marco Ugarte/AP Photo)

Passengers without their pants use a subway train during the “No Pants Subway Ride” in Berlin January 12, 2014. (Photo by Fabrizio Bensch/Reuters)

Participants of the “No Pants Subway Ride” stand on the platform at the Potsdamer Platz station waiting for the U2 Subway line in Berlin on January 12, 2014. (Photo by Odd Andersen/AFP Photo)

People taking part in the “No Pants Subway Ride” exit a train on the U2 Subway line in Berlin on January 12, 2014. (Photo by Odd Andersen/AFP Photo)

People take part in the annual “No Pants Subway Ride” in the subway in Brussels, January 12, 2014. (Photo by Eric Vidal/Reuters)

People pose for a photo as they take part in the annual “No Pants Subway Ride” celebrations on the streets of Brussels January 12, 2014. (Photo by Eric Vidal/Reuters)

A passenger without his pants waits for a train during the “No Pants Subway Ride” event at a subway station in Paris January 12, 2014. (Photo by Benoit Tessier/Reuters)

Participants of the No Pants Subway Ride ride a train on January 12, 2014 in Berlin, Germany. The annual event, in which participants board a subway car in January while not wearing any pants while behaving as though they do not know each other, began as a joke by the public prank group Improv Everywhere in New York City and has since spread around the world, with enthusiasts in around 60 cities and 29 countries across the globe, according to the organization's site. (Photo by Adam Berry/Getty Images)

Participants in the13th annual International “No Pants Subway Ride” travel on a London underground train in London, on January 12, 2014. (Photo by Leon Neal/AFP Photo)

Participants in the 13th annual International “No Pants Subway Ride” travel on a London underground train in London, on January 12, 2014. (Photo by Leon Neal/AFP Photo)

A participant in the13th annual International “No Pants Subway Ride” enters a London underground station in London, on January 12, 2014. (Photo by Leon Neal/AFP Photo)

Participants in the13th annual International “No Pants Subway Ride” pose for a picture at Paddington underground station in London, on January 12, 2014. (Photo by Leon Neal/AFP Photo)

Passengers without their pants check their mobile phones as they wait for a train during the “No Pants Subway Ride” event at Plaza de Castilla subway station in Madrid January 12, 2014. (Photo by Sergio Perez/Reuters)

Participants in the13th annual International “No Pants Subway Ride” travel on a London underground train in London, on January 12, 2014. (Photo by Leon Neal/AFP Photo)

A woman without pants is photographed by members of her team at an underground platform during the “No Pants Subway Ride” in Mexico City January 12, 2014. (Photo by Tomas Bravo/Reuters)

People take part in the “No Trousers Tube Ride” event next to other passengers on an underground train in London, Sunday, January 12, 2014. The stunt was held to coincide with the “Global No Pants Subway Ride”, where passengers board subway cars in the middle of winter without wearing trousers and act normally. (Photo by Matt Dunham/AP Photo)

A dog looks on as participants in the 13th annual International “No Pants Subway Ride” travel on a London underground train in London, on January 12, 2014. Started in 2002 with only seven participants, the day is now marked in over 60 cities around the world. The idea behind “No Pants” is that random passengers board a subway car at separate stops in the middle of winter, without wearing trousers. The participants wear all of the usual winter clothing on their top half such as hats, scarves and gloves and do not acknowledge each other's similar state of undress. (Photo by Leon Neal/AFP Photo)

A man without pants and wearing a mask sits in a subway train during the “No Pants Subway Ride” in Mexico City January 12, 2014. (Photo by Tomas Bravo/Reuters)

A woman reads during the annual No Pants Subway Ride in New York January 12, 2014. (Photo by Eric Thayer/Reuters)

Passengers without pants wait on a underground platform during the “No Pants Subway Ride” in Kiev January 12, 2014. (Photo by Gleb Garanich/Reuters)

A man sitting on a subway looks toward a passenger dressed for the annual No Pants Subway Ride in the Manhattan borough of New York January 12, 2014. (Photo by Darren Ornitz/Reuters)

Katerina Marie and Kevin Coleman participate in the No Pants Subway Ride 2014 joining other pantless riders invading MARTA at the Civic Center station on Sunday, January 12, 2014, in Atlanta. (Photo by Curtis Compton/Atlanta Journal & Constitution)

Riders joke as they wait for a train in the New York subway in their underwear while taking part in the 2014 No Pants Subway Ride on January 12, 2014. Started by Improv Everywhere, the goal is for riders to get on the subway train dressed in normal winter clothes without pants and keep a straight face. (Photo by Timothy Clary/AFP Photo)

Members of the Seed and Feed Marching Abominable band Eugene Grayson (from left), Cecilia Matthis, Britt Williams, and Charles Bohanan get into the spirit of the event showing off their underpants during the No Pants Subway Ride Atlanta 2014 event on MARTA, Sunday, January 12, 2014, in Atlanta. (Photo by Curtis Compton/Atlanta Journal & Constitution)

Katerina Marie and Kevin Coleman board MARTA for the No Pants Subway Ride 2014 joining other pantless riders invading MARTA at the Civic Center station on Sunday, January 12, 2014, in Atlanta. (Photo by Curtis Compton/Atlanta Journal & Constitution)

Passengers, not wearing pants, walk through a subway train transfer tunnel during the “No Pants Subway Ride” in Prague January 12, 2014. (Photo by David W. Cerny/Reuters)

Two riders in the New York City subway in the underwear as they take part in the 2014 No Pants Subway Ride January 12, 2014. (Photo by Timothy A. Clary/AFP Photo)

People taking part in the “No Pants Subway Ride” wait at a metro station in Mexico City on January 12, 2014. (Photo by Antonio Nava/AFP Photo)

Riders wait for a train in the New York subway in their underwear as they take part in the 2014 No Pants Subway Ride on January 12, 2014. (Photo by Timothy Clary/AFP Photo)

People taking part in the “No Pants Subway Ride” wait at a metro station in Mexico City on January 12, 2014. (Photo by Antonio Nava/AFP Photo)

Participants in the13th annual International “No Pants Subway Ride” pose for a photograph at Paddington underground station in London, on January 12, 2014. (Photo by Leon Neal/AFP Photo)