Tourists play at a beach covered by a thick layer of green algae in Qingdao, China, on July 3, 2013. A large quantity of non-poisonous green seaweed, enteromorpha prolifera, hit China's Qingdao coast last month. More than 20,000 tons of such seaweed has been removed from the city's beaches. This has now become an annual summer event. (Photo by Whitehotpix/ZumaPress.com)

Jose, a reveller covered in grease, poses for a photo as he takes part in the annual Cascamorras festival in Baza, southern Spain September 6, 2015. The festival was inspired by a dispute between the town of Baza and Guadix over the possession of an icon of the Virgin of Piedad. The Cascamorras refers to representatives from Guadix, who were sent to Baza to recover the statue. As the Cascamorras had to stay perfectly clean to gain possession of the statue, Baza residents attempt to make them as “dirty” as possible. (Photo by Marcelo del Pozo/Reuters)

A Hindu devotee offers prayers at the Sangam, the confluence of three rivers – the Ganges, the Yamuna and the mythical Saraswati, to take a ritualistic bath during Makar Sankranti festival that falls during the annual traditional fair of Magh Mela festival, one of the most sacred pilgrimages in Hinduism, in Prayagraj, India. Friday, January 14, 2022. (Photo by Rajesh Kumar Singh/AP Photo)

Participants take part in the 14th annual “No Trousers Tube Ride” event on the London Underground on January 12, 2025. The event, staged by Improv Everywhere, takes place every January in New York City and has since expanded internationally. What began as a small prank with just seven participants has grown into a global celebration of silliness, with dozens of cities, including London, joining in each year. (Photo by Guy Bell/Alamy Live News)

Kazuo Hirai, President and Group CEO of Sony Computer Entertainment America, presents the Playstation Vita at the Sony Playstation media briefing on the eve of the Electronic Entertainment Expo (E3) on June 6, 2011 in Los Angeles, California. More than 45,000 people are expected to attend the annual three-day convention to see the latest games and announcements from the gaming industry. (Photo by David McNew/Getty Images)

Participants enjoy mud during the 14th Annual Boryeong Mud Festival at Daecheon Beach on July 16, 2011 in Boryeong, South Korea. The mud, which is believed to have beneficial effects on the skin due to its mineral content, is sourced from mud flats near Boryeong and transported to the beach by truck. (Photo by Chung Sung-Jun/Getty Images)

A participant works on a laptop on the first day of the 28th Chaos Communication Congress (28C3) – Behind Enemy Lines computer hacker conference on December 27, 2011 in Berlin, Germany. The Chaos Computer Club is Europe's biggest network of computer hackers and its annual congress draws up to 3,000 participants. (Photo by Adam Berry/Getty Images)

A reveler poses for pictures at the Victorian Picnic during the Wave and Goth festival in Leipzig June 6, 2014. The annual festival, known in Germany as Wave-Gotik Treffen (WGT), features over 150 bands and artist in venues all over the city playing Gothic rock and other styles of the dark wave music subculture. The event, one of the biggest of its kind, attracts a regular audience of up to 20,000, the organizers said. REUTERS/Thomas Peter