Students stand in front of a burning portable toilet during a protest over planned increases in tuition fees at the Union Buildings in Pretoria, October 23, 2015. REUTERS/Sydney Seshibedi 

Protesters push a portable loo before burning it during a protest over planned increases in tuition fees outside the Union building in Pretoria, South Africa October 23, 2015. South African police fired stun grenades at students who lit fires outside President Jacob Zuma's offices following a week of protests, the first signs of the post-apartheid 'Born Free' generation flexing its muscle. REUTERS/Siphiwe Sibeko

A woman carrying a child sits in front of portable toilets at a migrant camp in Opatovac, Croatia October 19, 2015. The Balkans struggled with a growing backlog of migrants on Monday after Hungary sealed its southern border and Slovenia tried to impose a limit, leaving thousands stranded on cold, wet borders where tempers frayed. More than 10,000 were stranded in Serbia, the United Nations refugee agency (UNHCR) said, with more on the way but nowhere to go. REUTERS/Dado Ruvic TPX IMAGES OF THE DAY

Migrants pass rows of toilets in front of a canteen in a refugee camp in Celle, Lower-Saxony, Germany October 15, 2015. With the approach of winter, authorities are scrambling to find warm places to stay for the thousands of refugees streaming into Germany every day. In desperation, they have turned to sports halls, youth hostels and empty office buildings. But as these options dry up, tent cities have become the fall-back plan: despite falling temperatures, a survey by German newspaper Die Welt showed at least 42,000 refugees were still living in tents. Picture taken October 15, 2015. To match Insight EUROPE-MIGRANTS/GERMANY-WINTER REUTERS/Fabian Bimmer 

A reveller exits a mobile toilet during a "pow-wow" celebrating the Indigenous Peoples' Day Festival in Randalls Island, New York, October 11, 2015. The festival is held as a counter-celebration to Columbus Day and is to promote Native American culture and history. REUTERS/Eduardo Munoz 

One of the 3,000 portable toilets, one for every 250 people, set up for the public in Philadelphia, according to provider A Royal Flush Inc., remains locked in advance of the September 26-27 papal visit, in Philadelphia, Pennsylvania, September 24, 2015. The three largest events of Pope Francis's 6 day visit to the United States all occur in Philadelphia. REUTERS/Mark Makela 

A family and a bicyclist pass in front of portable toilets and barriers being erected to form a secure zone for the upcoming papal visit, September 26-27, in Philadelphia, Pennsylvania, September 23, 2015. Pope Francis will travel to Philadelphia in his six-day visit to the United States. REUTERS/Mark Makela 

Toilets are pictured in an empty makeshift camp at a collection point in the village of Roszke, Hungary September 17, 2015. REUTERS/Dado Ruvic 

A historical re-enactor uses a portable toilet in a living history camp during an anniversary event for the Battle of Bosworth near Market Bosworth in central Britain August 22, 2015. The Battle of Bosworth took place in 1485 during the Wars of the Roses between the House of Lancaster and the House of York. King Richard III was defeated by Henry Tudor marking the end of Plantagenet rule and the beginning of the Tudor dynasty. REUTERS/Neil Hall? 

An Elvis Presley tribute artist leaves a portable toilet at the four-day Collingwood Elvis Festival in Collingwood, Ontario July 25, 2015. Featuring over 120 Elvis tribute artists, it is the world's largest Elvis festival and last year hosted 30,000 visitors. Picture taken July 25, 2015. REUTERS/Chris Helgren 

A woman enters a mobile toilet with a mock skull on the roof at G7 opponents' tent camp on the field near the Loisach river in the outskirts of Garmisch-Partenkirchen, southern Germany, June 3, 2015. The camp is set a few miles from Elmau where the G7 leaders will meet. REUTERS/Wolfgang Rattay

An automated teller machine (ATM) is built inside a portable toilet shell during spring break festivities in Panama City Beach, Florida March 13, 2015. Like previous Florida spring break hot spots Fort Lauderdale and Daytona Beach, Panama City Beach is facing a crisis of conscience over the trade-offs involved in hosting a binge for some 300,000 students who arrive through mid-April with coolers, beer funnels and credit cards. Picture taken March 13, 2015. REUTERS/Michael Spooneybarger (UNITED STATES - Tags: BUSINESS EDUCATION SOCIETY TRAVEL) 

Participants in the 2015 Sydney Gay and Lesbian Mardi Gras parade pose for a photo as they wait to use a portable toilet March 7, 2015. The event, in its 37th year with 150 floats in the parade, celebrates gay pride and draws thousands of spectators. REUTERS/Jason Reed (AUSTRALIA - Tags: SOCIETY TRAVEL) 

A reveller waits outside a portable toilet during the second night of the Carnival parade of samba schools in Rio de Janeiro's Sambadrome February 16, 2015. REUTERS/Pilar Olivares (BRAZIL - Tags: SOCIETY ENTERTAINMENT) 

Reenactors playing the roll of British soldiers line-up near portable toilets following a reenactment of the Battle of New Orleans in the War of 1812, marking its bicentennial in Chalmette, Louisiana January 10, 2015. The participants, some of whom have travelled thousands of miles to join in the event, recreated the five clashes that comprise the battle, which some historians say was key in making the British honor the terms of a peace treaty signed in late 1814. Picture taken January 10, 2015. REUTERS/Lee Celano (UNITED STATES - Tags: ANNIVERSARY SOCIETY) 

A Tenderloin Pit Stop portable toilet trailer is seen in the Tenderloin District in San Francisco, California December 30, 2014. Operated by the San Francisco Department of Public Works, the solar-powered toilets are part of a six-month pilot project aimed to provide clean and secure portable toilets, used needle disposal and dog waste stations throughout the Tenderloin District in an effort to alleviate the problem of human feces on the streets. REUTERS/Stephen Lam (UNITED STATES - Tags: HEALTH SOCIETY) 

A visitor enters a portable toilet facility held open by an attendant in the Tenderloin District in San Francisco, California December 30, 2014. Operated by the San Francisco Department of Public Works, the solar-powered toilets are part of a six-month pilot project aimed to provide clean and secure portable toilets, used needle disposal and dog waste stations throughout the Tenderloin District in an effort to alleviate the problem of human feces on the streets. REUTERS/Stephen Lam (UNITED STATES - Tags: HEALTH SOCIETY) 

An attendant (L) speaks with a visitor as he unlocks the door to a toilet in the Tenderloin District in San Francisco, California December 30, 2014. Operated by the San Francisco Department of Public Works, the solar-powered toilets are part of a six-month pilot project aimed to provide clean and secure portable toilets, used needle disposal and dog waste stations throughout the Tenderloin District in an effort to alleviate the problem of human feces on the streets. REUTERS/Stephen Lam (UNITED STATES - Tags: HEALTH SOCIETY) 

An attendant opens a door to a toilet for a visitor in the Tenderloin District in San Francisco, California December 30, 2014. Operated by the San Francisco Department of Public Works, the solar-powered toilets are part of a six-month pilot project aimed to provide clean and secure portable toilets, used needle disposal and dog waste stations throughout the Tenderloin District in an effort to alleviate the problem of human feces on the streets. REUTERS/Stephen Lam (UNITED STATES - Tags: HEALTH SOCIETY) 

Vehicles drive past a Tenderloin Pit Stop station in the Tenderloin District in San Francisco, California December 30, 2014. Operated by the San Francisco Department of Public Works, the solar-powered toilets are part of a six-month pilot project aimed to provide clean and secure portable toilets, used needle disposal and dog waste stations throughout the Tenderloin District in an effort to alleviate the problem of human feces on the streets. REUTERS/Stephen Lam (UNITED STATES - Tags: HEALTH SOCIETY) 

A used needle disposal receptacle is seen next to two portable toilets in the Tenderloin District in San Francisco, California December 30, 2014. Operated by the San Francisco Department of Public Works, the solar-powered toilets are part of a six-month pilot project aimed to provide clean and secure portable toilets, used needle disposal and dog waste stations throughout the Tenderloin District in an effort to alleviate the problem of human feces on the streets. REUTERS/Stephen Lam (UNITED STATES - Tags: DRUGS SOCIETY HEALTH) 

An attendant stands outside two portable toilets in the Tenderloin District in San Francisco, California December 30, 2014. Operated by the San Francisco Department of Public Works, the solar-powered toilets are part of a six-month pilot project aimed to provide clean and secure portable toilets, used needle disposal and dog waste stations throughout the Tenderloin District in an effort to alleviate the problem of human feces on the streets. REUTERS/Stephen Lam (UNITED STATES - Tags: HEALTH SOCIETY) 

Staff of toilet manufacturer TOTO explain to King Willem-Alexander (2nd L) and Queen Maxima (L) of the Netherlands about the company's bedside flush toilets, which are portable and can be placed in various places, for people needing nursery care, as they attend the "Aging in Place" meeting at the university in Tokyo October 30, 2014. REUTERS/Yuya Shino (JAPAN - Tags: POLITICS ROYALS SCIENCE TECHNOLOGY HEALTH) 

A Catholic nun laughs as she comes out of a portable toilet before the start of the beatification ceremony of Opus Dei Bishop Alvaro del Portillo in Madrid September 27, 2014. Thousands of Opus Dei followers from around the world attended the open-air beatification mass of the former Opus Dei leader. REUTERS/Susana Vera (SPAIN - Tags: RELIGION) 

Sheep shelter around portable toilets on a remote peninsula on the Isle of Lewis, in the Outer Hebrides of Scotland September 14, 2014. The referendum on Scottish independence will take place on September 18, when Scotland will vote whether or not to end the 307-year-old union with the rest of the United Kingdom. REUTERS/Cathal McNaughton (BRITAIN - Tags: POLITICS ELECTIONS ENVIRONMENT ANIMALS) 

Members of a rowdy group of demonstrators drag a portable toilet onto the roadway during protests in reaction to the shooting of Michael Brown near Ferguson, Missouri August 18, 2014. Police fired tear gas and stun grenades at protesters in Ferguson, Missouri on Monday, after days of unrest sparked by the fatal shooting of an unarmed black teenager by a white policeman. REUTERS/Lucas Jackson (UNITED STATES - Tags: CIVIL UNREST CRIME LAW SOCIETY) 

A man leans against a portable toilet at the Woodstock Festival in Kostrzyn-upon-Odra, close to the Polish-German border, early August 2, 2014. Some 500,000 people attended the festival that is the brainchild of Polish journalist and social campaigner Jerzy Owsiak. He initiated the event to say thank you to those who donated money to his GOCC charity organisation that delivers medical care for children. REUTERS/Thomas Peter (POLAND - Tags: ENTERTAINMENT) 

A Bavarian mountain rifleman in a traditional outfit stands in front of portable toilets as he attends a parade in the southern village of Miesbach May 4, 2014. About 5,000 mountaineers from Bavaria joined the traditional annual parade to honour Patron Bavariae, the Patron of Bavarian mountain rifleman. REUTERS/Michael Dalder (GERMANY - Tags: SOCIETY RELIGION TPX IMAGES OF THE DAY) 

A portable toilet is pictured at the Panama Canal expansion project site during an organized tour by the Panama Canal authorities in Panama City February 21, 2014. A Spanish-led consortium resumed expansion work on the Panama Canal on Thursday, raising hopes the two sides will finally draw a line under an acrimonious stand-off over massive cost overruns. The Panama Canal Authority said late on Wednesday it had agreed with the consortium to iron out a host of remaining issues, including the delivery dates of massive lock gates being built in Europe, over the next three days. REUTERS/Carlos Jasso (PANAMA - Tags: POLITICS BUSINESS CONSTRUCTION) 

A clown uses a portable toilet before the 87th Macy's Thanksgiving day parade in New York November 28, 2013. REUTERS/Carlo Allegri (UNITED STATES - Tags: SOCIETY) 

Members of Brazilian indigenous ethnic group Javae-Itya use a portable toilet during the XII Games of the Indigenous People in Cuiaba November 14, 2013. Forty eight Brazilian Indigenous tribes will present their cultural rituals and compete in traditional sports such as archery, running with logs and canoeing during the XII Games of Indigenous People which will run until November 16. REUTERS/Paulo Whitaker (BRAZIL - Tags: SPORT SOCIETY) 

A portable toilet is seen at a layby along the A303 near Stonehenge, southern England September 6, 2013. REUTERS/Stefan Wermuth (BRITAIN - Tags: FOOD SOCIETY TRANSPORT) 

Portable toilets are seen in front of skyscrapers at the Qianhai special economic zone in Shenzhen August 16, 2013. A much-hyped land auction in the developing free-trade zone in southern China failed to attract any of Hong Kong's powerful property developers, signaling growing investor caution towards the ambitious $45 billion project. REUTERS/Tyrone Siu (CHINA - Tags: BUSINESS REAL ESTATE) 

Riot police stand guard as portable toilets are delivered during an anti-capitalism "Blockupy" demonstration in Frankfurt June 1, 2013. Thousands of demonstrators from the movement cut off access to the European Central Bank in Frankfurt to protest against policymakers' handling of Europe's debt crisis. REUTERS/Kai Pfaffenbach (GERMANY - Tags: CIVIL UNREST BUSINESS POLITICS) 

Folk dancers queue to use a portable toilet as they wait to perform during celebrations on the day of San Isidro in Madrid May 15, 2013. San Isidro, or Saint Isidore, is Madrid's patron saint as well as patron saint of the peasants and laborers. For several days up to St. Isidore Day on May 15th, Madrid honors its patron saint with celebrations that include fairs, concerts, dances and a pilgrimage to the San Isidro chapel where the faithful take what they believe is miraculous water. REUTERS/Susana Vera (SPAIN - Tags: SOCIETY RELIGION) 

Bomb sniffing dogs patrol before the start of the Salt Lake City Marathon in Salt Lake City, Utah, April 20, 2013. The Salt Lake City Marathon is the first major marathon since the April 15 bombing at the finish line of the Boston Marathon that claimed three lives. REUTERS/Jim Urquhart (UNITED STATES - Tags: SPORT ATHLETICS SOCIETY) 

A homeless man leaves a public toilet where he spent the night during the winter storm in Hoboken, New Jersey, February 9, 2013. A blizzard packing hurricane-force winds pummelled the northeastern United States on Saturday, killing at least one person, leaving about 600,000 customers without power and disrupting thousands of flights. REUTERS/Eduardo Munoz (UNITED STATES - Tags: ENVIRONMENT DISASTER) 

A clown uses a portable toilet as the sun rises over the 86th Macy's Thanksgiving Day Parade in New York, November 22, 2012. REUTERS/Carlo Allegri (UNITED STATES - Tags: SOCIETY) 

Basketball fans wait to use portable toilets surrounding a fighter jet as they attend the NCAA season opening basketball game between the Syracuse Orange and the San Diego State Aztecs on the flight deck of the decommissioned aircraft carrier USS Midway in San Diego, California November 11, 2012.

REUTERS/Mike Blake (UNITED STATES - Tags: SPORT BASKETBALL SOCIETY TPX IMAGES OF THE DAY) 

An indigenous woman enters a portable toilet during the People's Summit at Rio+20 for Social and Environmental Justice in Rio de Janeiro June 16, 2012. The People's Summit at Rio+20 for Social and Environmental Justice is a parallel event of the Rio+20 United Nations sustainable development summit that will be held from June 20 to 22. REUTERS/Sergio Moraes (BRAZIL - Tags: ENVIRONMENT SOCIETY) 

People sit on portable toilets to watch Queen Elizabeth returning along The Mall during Diamond Jubilee celebrations in St James Park, London June 5, 2012. REUTERS/Neil Hall (BRITAIN - Tags: SOCIETY ROYALS ENTERTAINMENT) 

Revellers wait outside portable toilets before the start of the second night of the annual Carnival parade in Rio de Janeiro's Sambadrome, February 20, 2012. The sign on the doors reads, "If it happens, us a condom," placed by the city's campaign to prevent the spread of AIDS. REUTERS/Nacho Doce (BRAZIL - Tags: SOCIETY) 

A supporter of Republican presidential candidate and former Massachusetts Governor Mitt Romney, Colonel Oscar Poole, emerges from a portable toilet cubicle before a campaign rally in Ormond Beach, Florida January 22, 2012. REUTERS/Brian Snyder (UNITED STATES - Tags: POLITICS) 

Portable toilets are seen at the Occupy LA protest encampment outside City Hall in Los Angeles, California November 25, 2011. Mayor Antonio Villaraigosa announced that City Hall Park will close at 12:01am on Monday, November 28, 2011, because the city of Los Angeles cannot maintain the public safety of a long-term encampment. During the period when City Hall Park is closed, a Free Speech area on the Spring Street City Hall stemps will remain open during regular park hours. REUTERS/Danny Moloshok (UNITED STATES - Tags: POLITICS CIVIL UNREST BUSINESS) 

Luke Donald of Britain leaves a portable toilet on the 16th hole during the final of the Volvo World Match Play Championship in Casares, near Malaga southern Spain, May 22, 2011. REUTERS/Jon Nazca (SPAIN - Tags: SPORT GOLF) 

A royal fan wears a Union flag with a photograph of Britain's Prince William and Kate Middleton, as she waits outside portable toilets on the Mall in London April 28, 2011. Britain's Prince William will marry Kate Middleton in Westminster Abbey on April 29. REUTERS/Stefan Wermuth (BRITAIN - Tags: ENTERTAINMENT ROYALS SOCIETY) 

A member of the Gruppo Storico Romano (Roman Historical Group) dressed as a centurion uses a portable toilet prior a march in Rome, to mark the 2,764th anniversary of the founding of the city April 17, 2011. According to legend, twins Romulus and Remus founded Rome on April 21 in 753 B.C.
REUTERS/Alessandro Bianchi (ITALY - Tags: ANNIVERSARY ODDLY SOCIETY) 

Chefs waiting to use a portable toilet gather at the construction site of the Shanghai Disneyland theme park before its ground breaking ceremony in Pudong of Shanghai April 8, 2011. Walt Disney Co broke ground on its long-awaited Shanghai Disneyland theme park in China's financial hub on Friday, banking on new attractions to draw millions of visitors and boost its profits in the region. REUTERS/Aly Song (CHINA - Tags: ODDLY SOCIETY BUSINESS) 

An outdoor toilet is seen on the Arctic ice at the 2011 Applied Physics Laboratory Ice Station north of Prudhoe Bay, Alaska March 18, 2011. Picture taken March 18, 2011. REUTERS/Lucas Jackson (UNITED STATES - Tags: ENVIRONMENT) 

Japan Self-Defence Force officers transport a temporary toilet to install it at a shelter for survivors at a village that was destroyed by an earthquake and tsunami in Yamada, northeast Japan March 17, 2011. REUTERS/Lee Jae-Won (JAPAN - Tags: DISASTER) 

A man places portable toilets in a beach-side suburb of Christchurch that remains without running water after Tuesday's earthquake February 25, 2011. International rescue teams searched through the rubble of quake-ravaged Christchurch on Friday for more than 200 people still missing, but rain and cold were dimming hopes of finding more survivors in the country's worst natural disaster in decades. REUTERS/Tim Wimborne (NEW ZEALAND - Tags: DISASTER) 

A home-made sign outside a damaged house asks for assistance in the form of a portable toilet in Christchurch February 24, 2011. International rescuers intensified their search for earthquake survivors in New Zealand on Thursday, despite fading hopes of finding any more people alive. REUTERS/Tim Wimborne (NEW ZEALAND - Tags: DISASTER SOCIETY IMAGES OF THE DAY) 

Performers on stilts rest near a row of portable lavatories before the dress rehearsal for the Chingay parade in Singapore January 22, 2011. The word Chingay means "the art of masquerade" in Chinese Hokkien dialect. Chingay parade is an annual street and floats parade held during the Chinese new year period in Singapore. REUTERS/Tim Chong (SINGAPORE - Tags: SOCIETY IMAGES OF THE DAY) 

A man lies down atop a portable toilet for a better view as thousands gather for comedians Jon Stewart and Stephen Colbert at the "Rally to Restore Sanity and/or Fear" on the National Mall in Washington, October 30, 2010. REUTERS/Jonathan Ernst (UNITED STATES - Tags: SOCIETY POLITICS ENTERTAINMENT) 

A policeman stands guard as a woman and child walk outside the Commonwealth Games athletes village in New Delhi September 28, 2010. India promised to have the athletes' housing for the Commonwealth Games cleaned up by Wednesday, and said workers were labouring at double time to have all facilities ready for the opening ceremony on October 3. REUTERS/Krishnendu Halder (INDIA - Tags: SPORT POLITICS) 

A boy sits on a toilet as he plays with a PlayStation at the ''PlayStation'' exhibition stand at the Gamescom 2010 fair in Cologne August 19, 2010. The Gamescom convention, Europe's largest video games trade fair, runs from August 18 to August 22. REUTERS/Ina Fassbender (GERMANY - Tags: SOCIETY) 

Soldiers stand in line outside portable toilets during the country's Bicentennial Independence Day celebrations in Bogota July 20, 2010. REUTERS/John Vizcaino (COLOMBIA - Tags: ANNIVERSARY MILITARY POLITICS SOCIETY IMAGES OF THE DAY) 

A girl poses beside toilets in the township of Alexandra in Johannesburg July 8, 2010. The five toilets are shared by the entire community of 10,000 people. The township of Alexandra, near the centre of the city, was established in 1912. REUTERS/Ina Fassbender (SOUTH AFRICA - Tags: SOCIETY) 

An anti-government 'red shirt' protester washes his clothes next to portable toilets inside the barricaded encampment at Bangkok's shopping district May 12, 2010. The Thai military said it would cut off supplies on Wednesday to anti-government protesters camped out in downtown Bangkok and might ultimately use force to clear them if they did not pack up and leave. REUTERS/Jerry Lampen (THAILAND - Tags: CIVIL UNREST POLITICS) 

An anti-government 'red shirt' protester washes next to portable toilets inside the barricaded encampment at Bangkok's shopping district May 12, 2010. The Thai military said it would cut off supplies on Wednesday to anti-government protesters camped out in downtown Bangkok and might ultimately use force to clear them if they did not pack up and leave. REUTERS/Jerry Lampen (THAILAND - Tags: CIVIL UNREST POLITICS)