Quote from Frasier in Frasier Grinch
Niles: Frasier, Frasier, Frasier. Look, look, look, there it is. It's up on the shelf. It's up on the shelf. Frasier: Oh, marvelous. [climbs up to get it] Niles: Oh, Lord. It's covered with dust. Frasier: Ah. The brain is dusty. Could there be a clearer metaphor?