U.S. Marines, left, and South Korean Marines, wearing blue headbands on their helmets, take positions after landing on the beach during the joint military combined amphibious exercise, called Ssangyong, part of the Key Resolve and Foal Eagle military exercises, in Pohang, South Korea, Saturday, March 12, 2016. North Korea said Saturday its military is ready to pre-emptively attack and “liberate” the South in its latest outburst against the annual joint military drills by the United States and South Korea. (Photo by Kim Jun-bum/Yonhap via AP Photo)

Hotel staff practice self-defence skills after a training session given by team member of Special Weapons and Tactics (SWAT) team, in Hangzhou, Zhejiang province, April 7, 2016. (Photo by Reuters/Stringer)

A worker lifts up tiles during a bodybuilding contest for tile factory workers as part of celebrating Indonesia Independence day at Jatiwangi village in Majalengka, Indonesia West Java province, August 11, 2017. Indonesia Independence day is on August 17, 2017. (Photo by Reuters/Beawiharta)

Members of the SubCielo company perform during the fifth annual Puerto Rico Circo Fest in San Juan, Puerto Rico, Saturday, March 10, 2018. The festival is held simultaneously in several spots on the streets of the Old San Juan city on March 10–11. (Photo by Ricardo Arduengo/AFP Photo)

Ride operator Van Mai wears a face mask against the spread of the coronavirus while working at the Playland amusement park at the Pacific National Exhibition, in Vancouver, British Columbia, Friday, July 10, 2020. (Photo by Darryl Dyck/The Canadian Press via AP Photo)

Street vendosr prepare grilled pigs to sell for the Chinese New Year celebrations at a market in Phnom Penh, Cambodia, 11 February 2021. Chinese people around the world celebrate the Lunar New Year, also known as the Spring Festival, which marks the year of the Ox. (Photo by Kith Serey/EPA/EFE)

A group of young women have 'a bit of a do' for Oxfam at St Pancras International and enjoy a screening of the nation's favourite chick-flick Dirty Dancing on February 28, 2011 in London, England. Oxfam is calling on women across the UK to get together with their female friends in March to celebrate women's achievements for the 100th anniversary of International Women's Day (March 8, 2011) and raise money to support their work with women living in poverty. www.oxfam.org.uk/do (Photo by Ian Gavan/Getty Images for Oxfam). LONDON, ENGLAND – FEBRUARY 28

Pretty Girls, Ugly Faces is a photo fad in which girls take pictures of themselves while posing in an unflattering manner, making a silly face or performing a physically strenuous activity.