As a card sent to him by his father reminded George in the 1997 episode, Festivus comes every Dec. 23. In real life, it was invented by the father of former “Seinfeld” writer Dan O’Keefe in 1966. O'Keefe incorporated it into the show when he wrote "The Strike" episode.

The “Seinfeld”-created holiday of Festivus is for those who are more apt to embrace their inner “bah, humbug!” than their Christmas spirit.