Quote from Niles in The Unkindest Cut of All
Niles: Oh, dear God, he's licking me! Frasier: Eddie, just stop. Oh, Niles, you have liver behind your ears. Niles: I imagine I must have picked up a cracker and inadvertently scratched behind my ear. Frasier: So you're telling me that you had a wad of cold meat behind your ears and didn't feel it? Niles: That's the story I'm sticking with, yes.