National Ding-A-Ling Day is one of those uniquely American inventions. It’s sort of a two-fer holiday where you touch base (preferably by phone — hence the playful reference to “ding-a-ling”) with friends or family you may have lost track of during the year. You also get a free pass to be just a little bit weird for the day. National Ding-A-Ling Day always takes place on December 12 but you can think of it as a second Halloween!