During and after World War I, a tradition began to ensure that members carried their medallion or coin at all times. This goal was pursued by having a member challenge another member by tapping the medallion on the bar. If the challenged member could not show the medallion, the challenged member had to buy a drink of choice for the challenger. If the challenged member could show a medallion, the challenger had to buy the drink. For many years after World War I, surviving members kept this tradition alive.