I don't know if anybody caught the Lisa Loeb show "Number One Single". In a nutshell, she went on a blind date with an author, and the author happened to have written a show about Festivus. He was having a book signing at Barnes & Noble in NYC, and Lisa went there to confront him about a quote he gave to the New York Post.
Anyway, Jerry Stiller was there, and there was a little clip where the author was talking about Festivus.