Each year, the residents of Laguna Niguel expose their buttocks during the “Mooning of the Trains” event along a railroad track in Orange County, south of Los Angeles.

According to a local legend, this tradition began in 1979 when customer K.T. Smith said he would buy a drink for anyone who would run outside and show his/her butt to the next train.

So for 30 years now, people over there have been mooning trains on the second Saturday of each July.