Season 3, Episode 23: "The Keys"

-So put them in a safe place. -I will.

-Where? -I don't know.

I'll hide them.

-So is Kramer upset? -I think so.

I mean, he's acting really weird lately. He's different.

-Just give him the keys back. -No, I can't.

Is that Kramer?

-Who's there? -Kramer.