Loved the show until Niles & Daphne "got together." Felt it lost most of the energy at that point.
The Niles doppelganger; any Bebe episode; "The Candidate" -- so many classics.
Anecdote:
My son's HS graduation. He receives an award from the headmaster. There is that sort of "pose for picture" handshake tableau. I start cracking up -- I mean wheezing, snot out my nose, cracking up ... because all I could see in that instant was the "Together, we can live the dream" line from The Candidate episode (I'll link it) -- which my son and I had seen together and had laughed over. My mother and wife had those "what the **** is wrong with you" faces going.
So in the car, I tell the story ... I swear, we had to pull over ... everyone was cracking up because they could remember the headmaster's exact pose, head tilt, and how it all came together (and it was fitting personality wise too).