So many for me to choose from, it’s a difficult choice. But here’s one of my favorites, from Broadcast News:
Paul Moore: “It must be nice to always believe you know better, to always think you’re the smartest person in the room.”
Jane Craig: “No. It’s awful.”
No, unless round is funny.
“My dear chap, I never would have dreamt of depriving you of your moment of triumph. Alas, a moment was all I could spare.”
This has come up on this Board before (I’ve pointed out the falsity of the “yonder lies da castle of my fadda” line myself). But I had to mention that an artist friend, Robin Wood, has a painting of a bunch of medieval/fantasy characters pointing off into the distance. The painting is entitled Yonder Lies the Castle of my Father. Gotta sense a Yuma, that Robin Wood.
“I won’t hit you this time. I won’t. Like hell I won’t…”
- John Wayne in *McClintock!*; starting the Hollywood barfight in the mud pit.I always kind of liked “For someone who was never meant for this world, I must confess I’m suddenly having a hard time leaving it. Of course, they say every atom in our bodies was once part of a star. Maybe I’m not leaving… maybe I’m going home.” From Gattaca
Beaten by VunderBob. But let me quote the whole speech:
“I know, I know. I’m gonna use good judgement. I haven’t lost my temper in forty years, but pilgrim you caused a lot of trouble this morning, might have got somebody killed… and somebody oughta belt you in the mouth. But I won’t, I won’t. The hell I won’t!”
Many memorable lines cited here, several of which I have no memory are still good quotes, catchy in their wording and sound or simply compellingly evocative, for example "“Buzzards gotta eat, same as worms.”
However I read some quotations and I wonder why would anyone ever quote such a line, let alone hold it as a favorite piece of language:
San Dimas High school football RULES!
Well? We’re WAITING”
“Now, where was I?”
"Hey, Dad? You wanna have a catch?
Really?
I saw (among others) Ethan Hawke say : "Call me what instrument you will, though you can fret me, yet you cannot play upon me. "
Not even a favorite but surely something more worthy of the name quotation than “Now where was I”
“I’m not playing with you. I will blow that little black, gnarled crusty, dead motherfucker the fuck off your foot! Now put the razor away!” - Harlem Nights
“Louie, I think this is the beginning of a beautiful friendship.”
"I love the smell of napalm in the morning. You know, one time we had a hill bombed, for 12 hours. When it was all over, I walked up. We didn’t find one of ‘em, not one stinkin’ dink body. The smell, you know that gasoline smell, the whole hill. Smelled like [sniffing, pondering] victory. Someday this war’s gonna end… " - Apocolypse Now
“I gave her my heart, she gave me a pen.” - Say Anything
“That’s bullshit. You’re not gonna do nothin’ like that. I’ll tell you what you gonna do. You gonna get a job. That’s what you gonna do. You’re gonna get a little job. Some job a convict can get, like scraping off trays in a cafeteria. Or cleaning out toilets. And you’re gonna hold onto that job like gold. Because it is gold. Let me tell you, Jack, that is gold. You listenin’ to me? And when that man walks in at the end of the day. And he comes to see how you done, you ain’t gonna look in his eyes. You gonna look at the floor. Because you don’t want to see that fear in his eyes when you jump up and grab his face, and slam him to the floor, and make him scream and cry for his life. So you look right at the floor, Jack. Pay attention to what I’m sayin’, motherfucker! And then he’s gonna look around the room - see how you done. And he’s gonna say “Oh, you missed a little spot over there. Jeez, you didn’t get this one here. What about this little bitty spot?” And you’re gonna suck all that pain inside you, and you’re gonna clean that spot. And you’re gonna clean that spot. Until you get that shiny clean. And on Friday, you pick up your paycheck. And if you could do that, if you could do that, you could be president of Chase Manhattan… corporations! If you could do that.” - Runaway Train
Two, both sort of army-ish. The first is from Kelly’s Heroes:
Crapgame: “Then make a deal!”
Big Joe: “What kind of deal?”
Crapgame: “A Deal deal!” Maybe the guy’s a Republican."
The second from Stripes:
General Barnenkey: “where have you been soldier?”
Bill Murray: " training Sir!"
Barnekey: “what kind of training?”
Murray: “Aaaaarmy training Sir!”
Barnekey: “So you completed basic training on your own?”
Murray: “That’s a Fact Jack!”
Hilarious!
“He’s adopted.”
The quote which has stuck with me from that film is from the opening, which depicts childhood scenes for the three main characters. Albert Brooks’ character has the crap kicked out of him by his classmates after giving the valedictory address at his high school graduation. After the beating, he tries to insult the goons who beat him up (apologies, I’m quoting from memory, and I know this isn’t quite correct):
Brooks: “You’ll never make more than $18,000 a year!”
Goon: “$18,000? That sounds pretty good to me!”
Yeah, Broadcast News is one of my favorite movies:
“Ok, I’ll meet you at the place near the thing where we went that time.”
Oooh! You beat me to it.
Limiting myself to one per movie, even though some of these flicks have many, many quotable lines:
“Shoot straight, you bastards - don’t make a mess of it!” - Breaker Morant
“I call that bold talk for one-eyed fat man.” - True Grit
“He’s not affiliated with me!” - The Incredibles
“Round up the usual suspects.” - Casablanca
“I would have would have followed you, my brother… my captain… my king.” - The Fellowship of the Ring
“Laugh-a while you can, monkey boy!” - Buckaroo Banzai
“And wear different-colored suits. This isn’t the Matrix.” - Limitless
“Sleep… now.” - Dark City
“Eggnog?” - Trading Places
“Take the gun; leave the cannoli.” - The Godfather
“I don’t believe in the no-win scenario.” - Star Trek II: The Wrath of Khan
“Alex, will you come in, please? I wish to talk to you.” - Notorious
“I find your lack of faith… disturbing.” - Star Wars
“Yeah, I remember the first time I got shot out of a cannon.” - True Lies
“It’s Lieutenant Hurwitz. Severe shell-shock. Thinks he’s Ethel Merman.” - Airplane!
“May I hold your trident, sir?” - Dirty Rotten Scoundrels
“Asps… very dangerous. You go first.” - Raiders of the Lost Ark
"If this man should fall, who will lift the flag and carry on? " - Glory
“Why don’t you kiss her instead of talking her to death?” - It’s a Wonderful Life
“Hasta la vista, baby.” - Terminator 2: Judgment Day
“He better be worth it. He better go home and cure a disease, or invent a longer-lasting light bulb.” - Saving Private Ryan
“That’s it, man! Game over, man, game over! What the fuck are we gonna do now?” - Aliens
"He said Mom was ugly - now go get him! " - Castle in the Sky
“I was hiding under your porch because I love you.” - Up
“My name is Maximus Decimus Meridius. Commander of the Armies of the North, General of the Felix Legions and loyal servant to the true emperor, Marcus Aurelius. Father to a murdered son, husband to a murdered wife. And I will have my vengeance, in this life or the next.” - Gladiator
“If you ladies leave my island, if you survive recruit training, you will be a weapon. You will be a minister of death praying for war. But until that day, you are pukes. You are the lowest form of life on Earth. You are not even human fucking beings. You are nothing but unorganized grabastic pieces of amphibian shit! Because I am hard, you will not like me. But the more you hate me, the more you will learn. I am hard but I am fair. There is no racial bigotry here. I do not look down on niggers, kikes, wops or greasers. Here you are all equally worthless. And my orders are to weed out all non-hackers who do not pack the gear to serve in my beloved Corps. Do you maggots understand that?” - Full Metal Jacket
“Watch it! Still a few crosses left.” - The Life of Brian
“You’ve got to know these things when you’re king.” - Monty Python and the Holy Grail
“Oh, thaaaat’s not right!” Galaxy Quest 
A couple from Chinatown:
“Look. You sue me. Your husband dies. You drop the lawsuit like a hot potato all of it quicker than the wind from a duck’s ass.”
“'Course I’m respectable. I’m old. Politicians, ugly buildings, and whores all get respectable if they last long enough.”
And a couple from Diner:
“I’ll hit you so hard, I’ll kill your whole family.”
“If you don’t have good dreams, you got nightmares.”
The Universe’s second most quotable movie? And no mention for three pages?
“Say hello to my little friend!”