Frasier: Dad, please, I'm sorry, I'm sorry, let me explain-
Martin: No, there's nothing to explain. I told you not to eavesdrop and you did it again, you are a very sick person.
Frasier: I tried to announce myself, but I had a mouthful of apple rendering me speechless.
Martin: Oh, I was a cop, you think I haven't heard that one before?