Niles: There's one sure way to get the truth. We'll call Aunt Vivian.
Frasier: Oh, no.
Daphne: Who's Aunt Vivian?
Niles: Better known as The Mouth, keeper of the Crane family skeletons.
Frasier: No, Niles, we are not calling Aunt Vivian.
Niles: Why? Are you scared you'll find out something you don't want to know?
Frasier: Yes. That she knows where I live and that she still drives.