Lilith: That's not Whiskers.
Frasier: Of course it is.
Lilith: No, it isn't.
Frasier: Yes, it is. Have you gone mad, woman? I'm telling you, I swear to you that this, this rat is Whiskers!
Lilith: My Whiskers was clever and bright-eyed. This rat is sluggish and slow.
Frasier: Well, he missed you. I missed you. I'm sluggish and slow, too.
Lilith: Also, Whiskers responds to the sound of my voice. This specimen shows no sign of recognition whatsoever. Whiskers? Whiskers? See? No response. Where's my rat, Frasier?
Frasier: Lilith, as a scientist and as your husband, I swear to you that this rat is Whiskers. And I must tell you I'm a little hurt by your accusation that I might try to fool you. I look you straight in the eye and I swear to you that this rat here is... He's on my shoulder, isn't he?
Lilith: Come here, Whiskers.
Frasier: Surprise! I got Whiskers a mate! Oh, you lucky rat. Oh! Now he has female companionship. Do I have female companionship?
Lilith: Not for a long, long time.
Frasier: [to the rat] Nice going, mister. Let's see if you're as sluggish in the snake cage.