The popular Seinfeld holiday, Festivus, originated from the personal life of writer Dan O'Keefe's father who created it to celebrate the anniversary of his first date with his wife. The real Festivus was different from the one shown on the show and included a clock inside a bag nailed to the wall and a sign that says, "F*** Fascism." While Dan regretted sharing the idea with the Seinfeld writers, his father embraced it and considered it a vindication of all his life decisions. The episode remains a classic and has become a staple among non-religious people during the holiday season.
