I didn't see a topic for this within fifteen pages, even though there was one for least favorite endings, which doesn't really collide with this.

Season 1
-Cooper snapping his fingers after telling Truman that he knows who killed Laura.
-Audrey in Cooper's bed.

Season 2:
-"The Great Northern Hotel", followed by unsettling shot of the hotel.
-Donna crying at the Roadhouse, Bobby knowing something is wrong and Cooper coming into realization.
-Maddy's body is found.
-Earle leaves a recording for Cooper in his hotel room.
-Miss Jones getting ready to kill Truman.
-"Next time it will be someone you know".
-Andy tells Cooper that the drawings are part of a map.
-"How's Annie" 

Hmmm, favorite endings.  If that means an ending where I couldn't wait until the next one (which was almost always), or what I think was really neat-O.

every damn thing in that first season kept me hooked.

The pilot with the gloved hand is great -but was probably also the introduction to the world.

Cooper's dream, and snapping along to the beat.

I appreciated the craft from Lynch's direction.  But in terms of pure fan and screaming...

Audrey in Cooper's bed.

Cooper getting shot.

The second season, the season premiere I was never riveted by BOB in the sense that I didn't care who killed Laura Palmer and got it was the catalyst for a deranged soap.

My favorite ending was Audrey calling Cooper and getting caught.  "Trouble Miss Horne?  You don't know what trouble is, not by a long shot."  Loved that little gasp Fenn does and surrounded by the red drapes.

I love the ending to 2.007 with Cooper's face over the red drapes, and needed the next episode STAT.

I love the ending to 2.008 with Cooper and Audrey, and the finding of Maddy's body. 

And I guess 2.006 with Cooper declaring the killer is at "The Great Northern Hotel." The killer's reveal was looming and it was a great cliffhanger for a week -who's at the Northern?  Ben? Audrey? Leland? Pete?

There were plenty of well made endings- "my name is Windom Earle?";  Leo's awakening;  Bob's reappearance in the grove- but I just wasn't as invested.

I was extremely excited when the episode ended in Diane Keaton's episode because Earle dropped the message off to Audrey and Cooper found the mask.  Up until then I thought they were just giving the other ensemble players their proper due and we'd finally get to the Earle/Audrey/Cooper plot that had been building from 2.001 through 2.008.

I hated the ending when Leland died and the computer generated owl zoomed into the lens.

The "How's Annie" ending never did much for me because I didn't care about Annie or most of the characters by then.  If it had been "How's Audrey?"  I would have been on the edge of my seat with a much more full circle payoff.

Hmmm, I also really liked the This is the Diary of Laura Palmer ending. 

Ben:  "We've laid in a gala reception for your fair-haired boys tonight.  All of Twin Peaks' best and brightest."

Jerry: "We're holding it in a phone booth?"