Fast Times at Ridgemont High: Phoebe Cates getting out of the pool.
I’ll be in my bunk.
Excellent thread. It needs to be nuked from orbit. It is the only way to be sure.
“I am Spartacus” “Oh Spartacus, won’t you die”
“2001” in four scenes - monkey touches plinth, “I’ve got a bad feeling about this”, Starjump iris shot, space baby.
“Full Metal Jacket” in two scenes “Six foot two - I did not know they stacked shit that high!” “Who’s the leader of the club that’s great for you and me?”
“Eyes Wide Shut” in two scenes - Nicole Kidman on the toilet and Tom Cruise staring at he gate while that creepy piano music plays
mm
Those are both from the same scene.
“Hey, you - Flock of Seagulls…”
Sorry OP, but 2001: A Space Odyssey has *three * scenes that need to be seen to “get” every reference to it
You forgot the stargate sequence at the end. Simpsons (and others, though none spring to mind at the moment) parodied it with a vibrating chair.
Three scenes: you forgot “Me so horny. Me love you long time!”
Geez, you gotta have, “Don’t go into the light!” and “All welcome! All welcome!”
Or pretty much the entire itty bitty voice woman’s dialog. But her part isn’t that big, you could bang Poltergeist out in 5 minutes.
The entire 007 series in 007 easy steps:
The opening sequence with Bond shooting somebody through the gunsight view and then the silouettes of naked women.
Bond saying “Bond…James Bond.”
Miss Moneypenny flirting, M quietly fuming, and Q handing Bond a gadget.
Goldfinger getting ready to give Bond a laser circumcision: “Do you expect me to talk?” “No, Mr Bond, I expect you to die.”
Blofeld and his white cat.
The volcano lair.
Oddjob.
Alien (Whatever number)
Actor: I thought you were dead!
Ripley, storming through the control room: “Yeah, I get that a lot”.
I think this led to a lot of other " Tough Woman" movies. The movie “Barb Wire” comes to mind though I’m sure there are many more.
Don’t forget the giant baby!
To Pulp Fiction, add the dance scene where John Travolta does that move where he puts his hand over his eyes (hard to describe in text, but you know what I mean).
Speaking of Travolta:
Saturday Night Fever:
-Travolta walks down the street to the tune of Stayin’ Alive.
-Travolta makes a disco move involving pointing your finger in the air, putting it down, and then putting it back up again.
I would consider that part of the acid-trip sequence.
And Little Nemo, where’s the martini? I’d think that’s more important than Q giving him the gadget du jour.
That’s four words 
Gone with the Wind, “Tomorrow is another day”.
From the Pink panther movies:
“Does your dog bite?”
Dreyfus: MINKEY??? You said MINKEY!!!
Clouseau: Yes… a Chimpanzee Minkey
“Kato, my little yellow friend, I am home!”
Can I toss in literature?
You know that classic advertising scene with the beautiful woman in front of billowing, sheer white curtains? That’s pretty much all you’ll ever need to know about The Great Gatsby.
While certainly a memorable movie, the only bits that really get referenced repeatedly in pop culture from The Princess Bride would be:
“Inconceivable!”
“I do not think that word means what you think it means.”
and
“My name is Inigo Montoya. You killed my father. Prepare to die.”
I disagree. Sure, it’s crazy like the acid-trip, but it’s a distinct scene broken up by the hotel bed scene, which I’m sure I’ve seen parodied as well.
Let me help you out here. 
And something with Chewbacca just for the sound (“Rrrrrrrrr!”) And maybe the death star.
And “ET, phone home” maybe.
Alien Resurection IIRC and the actor was probably Ron Pearlman.
Really the best scene is when Pearlman is like: “so you like…fought these things before? What did you do?”
Ripley “I died”.
While we’re at it, the only scenes from the Alien movies you NEED to see:
Alien - The breakfast table scene
Aliens - Get away from her you bitch
The original Star Wars trillogy has way to many scenes, but for the prequels:
Episode I - The pod race
Episode II - Samuel L Jackson cutting off Jango Fetts head with a purple lightsaber. When the hell could be cooler than that?
Episode III - NOOOOOOOOOOOOO!!!
Some others:
The Usual Suspects - the last scene
Goodfellas - Whatya mean I’m funny?!