Frasier Season 11 Episode 6

Ronee: Frasier, what are you doing?
Frasier: I didn't know you two were home. Uh, I was just cleaning the oven, I must have dozed off.
Ronee: Cool. Well, I gotta run. Goodnight, you two.
Martin: See ya.
(He waits until she is gone, then rounds on Frasier)
Martin: You have a disease!
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, I had a mouthful of apple rendering me speechless!
Martin: Oh, I was a cop, you think I haven't heard that one before?
(He storms out of the kitchen, Frasier follows him)
Frasier: You are just angry because I heard you lying to Ronee. You really expect to win Ronee's heart by inventing fictitious girlfriends? "Sheila," indeed!
Martin: (floundering) It's none of your business, and... you weren't supposed to hear it!
Frasier: Well, I did hear it.
Martin: No, you overheard it. It's like an illegal wiretap - it's inadmissible!
(Martin stalks to his room, Frasier follows him)
Frasier: Dad, you cannot build a relationship on lies!
Martin: Inadmissible!
Frasier: Dad!
Martin: IN-ADMISSIBLE!
Frasier: Fine!