Niles: Let her marry Schenkman, they deserve each other.
Frasier: Oh, I'm sorry, Niles. What happened?
Niles: Well, I reached the front gate and I was just about to ring the doorbell to ask her to let me in, when it suddenly dawned on me how many hours I have spent pleading with that woman through gates, through windows, through key holes, and through transoms and... in one disastrous instance, through the pet door.
Frasier: Yes, I remember dabbing Bactine on those Chihuahua bites.