Festivus

According to Seinfeld, Festivus is celebrated each year on December 23, but many people celebrate it other times, often in early December. Its slogan is "A Festivus for the rest of us!!" An aluminium pole is generally used in lieu of a Christmas tree or other holiday decoration, shedding holiday materialism. Those attending participate in the "Airing of Grievances" in which each person tells each and everyone else all the ways they've disappointed him/her over the past year, and after a Festivus dinner, The "Feats of Strength" are performed. Traditionally, Festivus is not over until the head of the household is wrestled to the floor and pinned.

This Seinfeld episode first aired on December 18, 1997 and featured this intriguing dialog:

Frank Costanza: Many Christmases ago, I went to buy a doll for my son. I reached for the last one they had, but so did another man. As I rained blows upon him, I realized there had to be another way.

Cosmo Kramer: What happened to the doll?

Frank Costanza: It was destroyed. But out of that a new holiday was born … a Festivus for the rest of us!

Cosmo Kramer: That must've been some kind of doll.

Frank Costanza: She was.

And so began the another weird TV tradition.