Residents of Laguna Niguel expose their buttocks to a passing Metrolink train during the annual "Mooning of the trains" event along a stretch of railroad track in Orange County, south of Los Angeles, California on July 13, 2019. - Local legend has it the tradition began in 1979 when customer K.T. Smith offered to buy a drink for anyone who would run outside and moon the next train. Since then, on the second Saturday of each July, people have lowered their inhibitions and their underwear and pressed their naked buttocks up against a wire fence as the trains go by. (Photo by Mark RALSTON / AFP)