Season 9, Episode 10: "The Strike"

-What's Festivus? -When George was--

-No. -His father--

Stop it. It's nothing.

It's a stupid holiday my father invented. It doesn't exist.

Happy Festivus, Georgie.

Frank invented a holiday? He's so prolific.

Kramer. Listen, I got a little phone relay going.

So if a guy calls H & H and he's looking for me, you take a message.