Fetchez la vache !
…
Mooooooooh !
The Holy Grail, Monty Python
This one freaks me out every time. Silence of the Lambs, when Buffalo Bill says:
“It puts the lotion in the basket…”
“PUT THE FUCKIN’ LOTION IN THE BASKET!”
More Jack Burton…
Ok, you people! Sit tight, hold the fort and keep the home fires burning. And if we’re not back by dawn… call the president.
When some wild-eyed, eight-foot-tall maniac grabs your neck, taps the back of your favorite head up against the barroom wall, looks you crooked in the eye and asks you if ya paid your dues, you just stare that big sucker right back in the eye, and you remember what ol’ Jack Burton always says at a time like that: “Have ya paid your dues, Jack?” “Yessir, the check is in the mail.”
More Princess Bride…
You mean, you’ll put down your rock and I’ll put down my sword, and we’ll try and kill each other like civilized people? -Westley
As you know, the concept of the suction pump is centuries old. And really, that’s all this is, except that instead of sucking water, I’m sucking life. I’ve just sucked one year of your life away. I might one day go as high as five, but I really don’t know what that would do to you, so let’s just start with what we have. What did this do to you? Tell me. And remember, this is for posterity, so… be honest. How do you feel? -Count Rugen
Lastly, my personal favorite…
We’ve all been raised on television to believe that one day we’d all be millionaires, and movie gods, and rock stars. But we won’t. And we’re slowly learning that fact. And we’re very, very pissed off. -Tyler Durden
From Moonstruck:
Olympia Dukakis: “Old man…you feed another piece of my food to that dog, I’ll kick you 'til you’re dead.”
Ibid:
Nick Cage: “I’m in love with you.”
Cher: ::slap:: ::slap!:: “Snap out of it!”
This is technically from a book, but the book was made into a movie:
“A Child’s Christmas in Wales”
Grandfather (played by Denholm Elliot): “…I can never remember whether it snowed for six days and six nights when I was twelve or whether it snowed for twelve days and twelve nights when I was six.”
Too many from Lebowski/Fight Club to mention, so I’ll go with my favorite outside of those two from “Once Upon a Time in the West”:
Three of Jack’s men are at an empty station when Harmonica (Charles Bronson) steps off of a train:
Harmonica: Did you bring a horse for me?
Man 1 (laughing): No, it looks like we’re one short.
Harmonica (shaking head): You brought two too many…
There are so many from Pulp Fiction, some already mentioned. But my favorite is:
“You hear me talkin’ hillbilly boy?! I ain’t through with you by damn sight. I’m gonna get medieval on your ass.”
Are we talking memorable one-sentence movie dialogue or short speeches? I’ll just offer some lines I quote in everyday conversation.
In any event. . .
From Sweet Smell of Success
“President? My big toe would make a better President!”
“I wouldn’t want to take a bite outta you. You’re a cookie filled with arsenic.”
“Match me, Sidney.”
From The Man Who Shot Liberty Valance
“This is the west, sir. When the legend becomes fact, print the legend.”
From Dangerous Liaisons
“You’ll find the shame is like the pain, you only feel it once.”
“Like most intellectuals, he’s intensely stupid.”
From The Women
“There’s a name for you ladies, but it isn’t used in high society, outside of a kennel.”
From All About Eve
“I’m nobody’s fool, least of all yours.”
“Fasten your seatbelts, it’s going to be a bumpy night!”
“I’ll admit I may have seen better days… but I’m still not to be had for the price of a cocktail, like a salted peanut”
From Steel Magnolias
“I’m not crazy, I’ve just been in a very bad mood for the last 40 years!”
"There’s so much static electricity in this room, I pick up everything but boys and money. "
“I’m not as sweet as I used to be.”
“The only thing that separates us from the animals is our ability to accessorize”
“A dirty mind is a terrible thing to waste.”
“There is no such thing as natural beauty.”
From Jackie Brown
“My ass may be dumb, but I ain’t no dumbass.”
From Tank Girl
“Look, it’s been swell, but the swelling’s gone down.”
"You gotta think about it like the first time you got laid. You gotta go: “Daddy, are you sure this is right?”
“Look, if you want to torture me, spank me, lick me, do it. But if this poetry shit continues just shoot me now please.”
And pretty much every line of dialogue from BtVS
That movie was just one great line after another. Was it that, or Ace in the Hole that had the line:
“I’ve met some hard-boiled eggs before, but you’re twenty minutes!”
I saw them both as a double-feature years ago, and can’t remember which is which.
Rodney Dangerfield to Sally Kellarman in Back to School:
“Call me sometime, when you have no class!”
From “A Man for All Seasons” spoken by Thomas More
From “The Lion in Winter”
and
and possibly the very best
You beat me to it! I just watched that movie the other day, and was going to say this one too.
“I don’t give a fuck, Riggs. That’s why I don’t have an ulcer, because I know when to say I don’t give a fuck.”
-The Captain from the Lethal Weapon movies
Clint Eastwood as Josey Wales in The Outlaw Josey Wales:
Since you mentioned a Man for all Seasons, how about this;
“Why, Richard, it profits a man nothing to give his soul for the whole world. But for Wales!”
“Shut up and sit down, you big bald fuck!” - Dennis Farina as Avi in Snatch.
This line has me crying with laughter every time I hear it. 
Am I the first to mention this one?
Moulin Rouge: The greatest thing you’ll ever learn is just to love and be loved in return.
The end-all and be-all of one-liners, IM(not-so)HO.
**Sheriff Pangborn:**Did you see that!? The Devil just blew up your church!
**Priest:**That’s not the Devil! It’s those GOD DAMN BAPTISTS!
Nobody’s mentioned Torch Song Triology? I guess it is a little obscure. Every second line is quotable.
Best one-liner I can remember:
(said to a man who’s catcalling from the audience):
Bertha Vanation: “How rude! You have a high voice for a lesbian!”
And not a one-liner, but still funny:
(between a pair of drag queens in the opening show):
Bertha Vanation: “Wait’ll you see my act: Bertha Vanation, and the Dance of the Virgins.”
Marsha Dimes: “Which she does completely from memory!”
This one from “The Princess Bride”:
“Hello, my name is Inigo Montoya, you killed my father, prepare to die.”
From all the “Star Wars” movies:
“I have a very bad feeling about this.”
Two from “This is Spinal Tap”:
“There’s a very fine line between clever and stupid.”
“This goes to 11.”
And if you’ve seen “Clerks,” you know this one:
“37!”
Rustler’s Rhapsody:
Sidekick: Roy, you shot him in the head! What do you have to say about that?
Roy: I missed his hand.
Oh, yeah…
Pirates of the Caribbean:
British Commander: You, sir, are undoubtedly the worst pirate I have ever heard of.
Jack Sparrow: Ah, but you have heard of me.
And several others - pretty good movie for one-liners.