The Straight Edge "X" can be traced to the Teen Idles' brief U.S. West Coast tour in 1980.[33] The Teen Idles were scheduled to play at San Francisco's Mabuhay Gardens, but when the band arrived, club management discovered that the entire band was under the legal drinking age and therefore would be denied entry to the club. As a compromise, management marked each of the Idles' hands with a large black "X" as a warning to the club's staff not to serve alcohol to the band. Upon returning to Washington, D.C., the band suggested this same system to local clubs as a means to allow teenagers in to see musical performances without being served alcohol.