Niles: It would be so much easier if Roz were mentally incompetent.
Frasier: Go on.
Niles: Well, then there'd be some justification for protecting her. Is she irrational?
Frasier: She did attack a vending machine once. When a Twinkie came out of the Oreo chute.
Niles: Borderline, borderline. Does she ever act delusional?
Frasier: Well, she often claims that she is responsible for the success of our show.
Niles: Building, building. Does she display below-average intelligence?
Frasier: She once ordered a bottle of white Zinfandel.
Niles: Jackpot! Go to her, she's a threat to herself.
Frasier: It's amazing they even let the woman drive.