The holidays are a stressful time, making them the perfect setting for sitcom episodes. That includes not only the many episodes based around Christmas, Thanksgiving, and other traditional holidays, but also the smaller, more creative ones too. And there's no other "made-up" holiday quite like Festivus, celebrated by the gang on the NBC classic "Seinfeld." In the "Seinfeld" canon, Festivus takes place on December 23 and was created by George's (Jason Alexander) father Frank (Jerry Stiller) as a way to combat the stresses of the commercialized religious winter holidays. 

In the Season 9 episode "The Strike," Frank introduces others to the tradition, which includes an unadorned Festivus pole, a special airing of grievances, a dinner, and even some wrestling. It's a really fun episode and some fans have even started practicing Festivus on their own. However, it turns out that this fictional holiday actually started with something one of the "Seinfeld" writers...