I, Dr. Simon Finch-Royce, being of sound mind and body declare that Sam and Diane shall be happy together throughout all eternity and if I am wrong I promise I will take my own life in the most disgusting manner possible." Here, take the tape, NO, take the whole machine. It’s my wedding gift to you. The most perfect couple since the DAWN of TIME!
Diane (to Sam): See?
There was an episode where most of the action was taking place inside to office. Meanwhile the barflies were discussing the Roadrunner cartoons, and we would hear snippets of the (increasingly heated) conversation whenever the door opened. I still grin like a fool when I think of Frasier bellowing, “The Coyote was NOT the Anti-Christ!!”
I think Cheers is the best TV comedy of all time.
Years ago I went away with my wife on one of her business trips. I was left alone in our hotel room one night and watched an episode of Cheers that I had seen before. It was great.
A few nights later we were back home and the same episode came up as a repeat on late night television. I started watching it again and watched the whole thing. It was still laugh out loud funny, even though I had seen it a few days before. Again it was great - the writing, the dialogue, the perfomances; all perfect.
NO NO NO! Cliff on Jeopardy is the greatest 30 min in TV history! 
“Who are three people who’ve never been in my kitchen?”
For those so fortunate as to get HDNet on their cable/satellite systems, they run Cheers in the early mornings (weekdays, 6-7AM ET). I’m not sure if Cheers in HD is a good thing or a bad thing – seeing a HD Carla early in the morning could ruin your entire day.
“Ma, you remember another Benito Mussolini, made a lot of people very angry?”
“I just don’t see why one fascist dictator has to ruin it for the whole family!”
Later, it’s determined that for the sake of peace in the family, Gino’s name is now Benito Mussolini Tortelli. Gino for short. 
I was going to ask if anyone knew where the old-timey photos used in the credits came from, but it seems the SDMB beat me to it - is there anything you can’t learn here? (Kansas is the answer!)
Diane: “If a tree falls in the forest, and there is no one to hear it, does it make a sound?”
Coach: “Well, if no one was there to hear it, how do you know it fell? Maybe some beavers just laid it down there…”
Awesome. His opponents were a chief of neurosurgery and a distinguished lawyer, and the first set of categories were something like, Stamps of the World, Civil Servants, Beer, and Bar Trivia.
The other two categories were Mothers and Sons, and Celibacy. That was a hilarious episode.
You border on the Adriatic…
Let’s hang him in effigy!
No, let’s hang him here in Boston!
Carla: My husband Eddie is with the Pittsburgh Penguins! I love their uniforms!
(Eddie comes in,wearing a penguin costume from the ice show)
Woody: You’re right, they do have nice uniforms.
Cheers is the only sitcom so great that they changed a major character whom I loved and I didn’t even mind. Rebecca came with an entirely different energy, and she was hilarious. Love Cheers.
They managed a similar thing when Nicholas Colasanto died, bringing Woody Harrelson to the fore. But yeah, love Cheers.
Yes. You are right! Woody was awesome, even though I loved Coach.
“Lance Manyon”
I think Woody’s line was more like:
Wow. Carla, are their home uniforms that nice?
In the very first episode, Diane got a taste of things to come when she heard the barflies discussing the important question of the moment:
“What was the sweatiest movie of all time?”
A question which I asked here once in Cafe Society. It generated some great replies.