Revelers gather on a commuter train platform of the HVV city public transportation system to drink alcohol on September 30, 2011 in Hamburg, Germany. Thousands of people participated in the event dubbed the “HVV Abschiedstrinken” (HVV Farewell Drink) that was organized through Facebook and is meant to celebrate the last day before a ban on alcohol consumption goes into effect on the city's public transport. (Photo by Joern Pollex/Getty Images)

Participants gather in the Union Square subway station during the annual No Pants Subway Ride on January 8, 2012 in New York City. The annual event is staged by the group Improv Everywhere which encourages people in dozens of cities worldwide to discard their pants while riding the subway. (Photo by Mario Tama/Getty Images)

A tourist watches as the moon passing in front of the sun as it approaches a full solar eclipse in the northern Australian city of Cairns November 14, 2012. (Photo by Tim Wimborne/Reuters)

Boy rests on bags of recyclable waste at a rubbish dump outside Yemen's Red Sea port city of Houdieda January 19, 2016. (Photo by Abduljabbar Zeyad/Reuters)

Pro-government fighters stand next to a tank destroyed during recent fighting in Yemen's southwestern city of Taiz March 14, 2016. (Photo by Anees Mahyoub/Reuters)

Ultra-Orthodox Jewish men prepare matza, traditional unleavened bread eaten during the upcoming Jewish holiday of Passover, in the southern city of Ashdod April 17, 2016. (Photo by Amir Cohen/Reuters)

A boy holds the remains of a mortar shell which hit a residential building in the village of Staromikhailovka, outside the separatist-held city of Donetsk, Ukraine, May 24, 2016. (Photo by Alexander Ermochenko/Reuters)

A zoo employee feeds a 3-week-old Eurasian eagle owl at the Royev Ruchey zoo on the suburbs of the Siberian city of Krasnoyarsk, Russia June 7, 2016. (Photo by Ilya Naymushin/Reuters)