In 2003, at the Seijin-shiki ceremony held in Himeji City, there was an incident where several groups of new adults started fighting in the parking lot near the hall after the ceremony ended, and also committed violence against two Japanese policemen belonging to Himeji Police Station, Hyogo Prefectural Police Department, who tried to stop the fighting.
2003年には姫路市の成人式で、式典終了後に会場周辺の駐車場で、新成人の複数の集団が喧嘩となり、止めに入った兵庫県警察姫路警察署の日本の警察官2名にも暴力を加える事件が発生した。