You can't spell 'festivus' without 'us'. And 'festi'.

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.

Thank you, Piers, for the Best. Festivus. Ever.