A woman laughs as residents of Laguna Ni

A woman laughs as residents of Laguna Niguel prepatre to expose their buttocks during the 30th annual "Mooning of the trains" event along a stretch of railroad track in Orange County, south of Los Angeles on July 11, 2009. 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. AFP PHOTO/Mark RALSTON (Photo credit should read MARK RALSTON/AFP via Getty Images)