Elaine: Where's Karen?
Receptionist: She went to pick up lunch.
Elaine: She didn't ask me what I wanted.
Receptionist: She must have forgot.
Elaine: How could she forget? I've been ordering lunch every day here for three and a half years? Is there something you're not telling me because I'm getting a really weird vibe. Is Lippman getting rid of me? It's OK, I won't say anything.
Receptionist: I don't know anything.
Elaine: Ah, you don't know anything. You see, "I don't know anything" means there's something to know. If you really didn't know anything you would have said, "You're crazy."