Antonio Banderas and Salma Hayek, ‘Desperado’ (1995) - two of the most beautiful actors in the history of movies - where they are on the bed, she’s singing softly, and he is watching the window behind her, looking for the bad guys to make their move. (and later they are casually walking away from the Big Exploding Fireball as seen in many productions since.).
Heh, I was actually about to mention her transforming into a Vampire after her sexy dance in From Dusk 'til Dawn.
Out of Africa - musical theme and airplane over Lake Naivasha
I remember the scenes with Jason Robards (as Washington Post editor Ben Bradlee) in All The President’s Men. In one scene, he leaned back in a chair in the newsroom, crossing out lines in Woodward and Bernstein’s draft story. They protest but he yells, “You haven’t got it!” And then in a later scene, after reading the draft, as he walks away, he raps a column, apparently pleased with the story. And then later, they visit him at his home. He gives them a little speech, ending with, “We’re under a lot of pressure, you know, and you put us there. Nothing’s riding on this except the, uh, first amendment to the Constitution, freedom of the press, and maybe the future of the country. Not that any of that matters, but if you guys fuck up again, I’m going to get mad. Goodnight.”
(Except for the quoted dialogue, which I copied from IMDB, the rest is from memory, so forgive me if I’m misremembering stuff.)
From All About Eve. The scene where Addison Dewitt is telling Eve Harrington that he’s on to all her lies and that he knows just who she really is. Then he blackmails her into becoming his mistress by threatening to expose her on the day of her big debut in the play. George Sanders and Anne Baxter just crushed it in that scene.
Most of the scenes in this movie are stellar, but I have to see that particular one to feel complete.
Coming to America - Eddie Murphy (as the Old Jewish Man) telling the waiter joke
When Jaws came out in 1975 I saw it at the theater three weeks after it opened.I’d heard some of the spoilers, like the head coming out of the hole in the bottom of the boat. But I hadn’t heard of that scene. I was in a packed theater at midnight, and when Bruce the shark showed up everyone was screaming and making pushing motions with their hands, including me of course. It may not have been the scariest scene but I will never forget it.
Too late to edit my previous post, but I loved that scene. “Whataya know from funny?”
My favorite Coming to America scene:
“What am I, father? A 21-year-old man who has never tied his own shoes!”
“No, you are a 21-year-old prince who had never tied his own shoes. I tied my own shoes once. It is an overrated experience.”
My daughter and I were watching Trading Places on TV when I realized they had cut the setup to the Men’s Room scene, where Eddie Murphy overhears the Duke brothers talking about why they’d hired him.
I wouldn’t say we were “disappointed” with the rest of the film, but it would have been more enjoyable if I hadn’t had to explain that Murphy was crouching on the toilet seat because he’d climbed up by the air vent to smoke the joint he pocketed.
Another time, we were watching Rain Man on TV and the bastards cut out the entire scene where Ray is about to freak out if he can’t watch Jeopardy! (or was it People’s Court?) on schedule. It’s my favorite scene, and I was really POed. 
That’s like when I watch Sound of Music and they cut out the wedding!
In the second case, they’d cut it out to put in more commercials, not because it showed someone enjoying a controlled substance.
A few years back, I was talking to a coworker about the crap movie U-571, which had been on TV the previous evening. He couldn’t figure out why the Americans expected their officer to speak German when they “rendezvoused” with a Nazi boat in the middle of the Atlantic.
He had missed the scene near the beginning of the picture when the officer had made a big deal about knowing German better than the seaman who really did speak it. He just froze when he had to converse with a native speaker.
Of all the great scenes from Pulp Fiction, the scene in Zed’s basement ties the whole movie together.
This is Spinal Tap
The band is playing their first gig after Nigel quits. A theme park, billed after Puppet Show. As they start the Free-Form Jazz Odessey, the crowd reaction shots are just hysterical. The kid with his chin on his hand, giving the Thumbs-Down makes me laugh hysterically every time. He’s at 1:30
Spinal Tap Mk.II A Jazz Odyssey
In Mad Mad World, I love the control tower scene where the guy says, “Why don’t we shoot them down and be done with it?” Classic!
How about that scene in Glengarry Glen Ross with Alec Baldwin? I remember nothing from that movie but that scene and I still look it up on YouTube all the time.
This has reached the level of household vernacular.
“Cuddles are for closers.”
Three “Jaws” references and no mention of Quint’s U.S.S. Indianapolis monologue?
In keeping with the season: There is a scene in It’s a Wonderful Life, where George (Jimmy Stewart) suddenly realizes that none of this is a dream, and that he was actually never born. He does a slow take as he turns to look directly into the camera with a look of horrified realization. It strikes me every time as an actor at the peak of his skills.
Margot Tenenbaum in “The Royal Tenenbaums” walking in slow motion of he bus at the bus station, with ‘These Days’ by Nico playing.
I can feel love and sadness they share with each other.
Edit: …and in “Gremlins” when a gremlin blows up in the microwave!
Crimson Tide, the scene where the conflict between Denzel Washington’s and Gene Hackman’s characters erupts.
For me, the moment is where Washington as the Executive Officer realizes he can’t go along, is going to have to say so and it’s going to be a big, big deal. He shakes his head and takes a breath before saying, “Captain, I cannot concur.”
James Stewart trying to figure out how to sit down at the Moroccan restaurant in The Man Who Knew Too Much.
