A car wash was demolished recently in Galveston (my hometown), and this old Triple X Ginger Ale sign was revealed:
Triple X Ginger Ale was apparently "The Aristocrat of Them All." I guess drinking it made people feel like they were rich or something. According to this site, the Triple X brand was brewed on the Island. The sign is probably from the 1920s, and it has been hidden for decades.
Also in Galveston, down on and near The Strand: