"The One With the Holiday Armadillo" (2000)
Ross is trying to get his son, Ben, excited about Hanukkah, but the kid's more taken with Santa Claus. But when the costume store is out of Santa costumes, the Holiday Armadillo is born, with Ross telling the enthralled Ben all about the Maccabees. It's a sweet moment, until Chandler shows up as Santa and the Holiday Armadillo gets demoted. Count on Phoebe for some cool insanity: She has a holiday skull, to remind us during the season that people do die.
Pictured from left: Courteney Cox Arquette and David Schwimmer.