File this under “you learn something new every day.” The sacred holiday Festivus, which most of us became acquainted with in the 1997 Seinfeld episode “The Strike,” is in fact much older. It dates to 1966, in which it was created and first celebrated by Daniel O’Keefe, father of Dan O’Keefe, one of the writers who cooked up the fictionalized TV version. Decorations are easy—all you need is an aluminum pole. There’ll be a holiday meal with friends and family, of course; meatloaf on a bed of lettuce should do the trick. But before you eat, there’s the airing of grievances, and afterward, feats of strength—the host chooses one guest for a wrestling match, and Festivus isn’t over until the host is pinned. If you need complete instructions for putting together a memorable Festivus celebration, you can find them online, or for much more detail, read the book (yes, there’s an actual book): Festivus! The Book: A Complete Guide to the Holiday for the Rest of Us by Mark Nelson. For bonus points, put a clock in a bag and nail it to the wall!