I watched “Seven Men From Now” where
Randolph Scot says: “I’d hate to have to kill you, Masters.”
And Lee Marvin replies, “I’d hate to have you try.”
From “The War Wagon”; they just shot two Bad Guys.
Kirk Douglas:“Mine hit the ground first.”
John Wayne: “Mine was taller.”
John Wayne in McClintock!:
From The Undefeated:
*Ann Langdon: You went out there to talk! Why did you kill that man?
John Henry Thomas: Conversation just kinda dried up, ma’am. *
“That’s the biggest Reb I ever saw.”
“That’s the biggest anything I ever saw!”
“Windage and elevation, Mrs. Langdon. Windage and elevation.”
**Unforgiven **
Little Bill: Well, sir, you are a cowardly son of a bitch! You just shot an unarmed man!
Will Munny: Well, he should have armed himself if he’s going to decorate his saloon with my friend.
English Bob: Well, actually, what I heard was that you fell off your horse, drunk of course, and that you broke your bloody neck.
Little Bill: I heard that one myself, Bob. Hell, I even thought I was dead 'til I found out it was just that I was in Nebraska.
Will Munny: It’s a hell of a thing, killing a man. Take away all he’s got and all he’s ever gonna have.
The Schofield Kid: Yeah, well, I guess they had it coming.
Will Munny: We all got it coming, kid.
And my favorite;
Will Munny: All right, I’m coming out. Any man I see out there, I’m gonna shoot him. Any sumbitch takes a shot at me, I’m not only gonna kill him, but I’m gonna kill his wife, all his friends… and burn his damn house down.
The Good,The Bad and the Ugly
Man With No Name: You see, in this world there’s two kinds of people, my friend: Those with loaded guns and those who dig. You dig.
I don’t think it’s nice, you laughing. You see, my mule don’t like people laughing. Gets the crazy idea you’re laughing at him. Now if you’ll apologise, like I know you’re going to…I might convince him that you really didn’t mean it.
If you ask me, that’s one very sensitive mule.
From Once Upon a Time in The West;
Charles “Harmonica” Bronson is greeted at a train station by three guys who are actually there to kill him. Noting that they don’t have a horse for him, he realises whats about to happen. He asks where his horse is…
Bad Guy (Laughing); Well, Boy… Looks like we’re shy one horse.
Harmonica; No… You brought two too many.
From The Virginian (the 1929 version with Gary Cooper):
Trampas: When I want to know anything from you, I’ll tell you, you long-legged sonova -
The Virginian: If you wanna call me that, smile.
Trampas: With a gun against my belly, I always smile.
“Are you gonna pull those pistols or whistle Dixie?”
-Josey Wales, The Outlaw Josey Wales
"To hell with them fellas. Buzzards gotta eat, same as worms. "
-Josey Wales, The Outlaw Josey Wales
From El Dorado:
Cole Thornton (John Wayne): “What about learning to use a gun?”
Mississippi (James Caan): “Johnny didn’t believe in guns. He thought…”
Cole Thornton: “He’s dead. Think about that.”
“Fill your hand, you son of a bitch.”
Some more good ones from The Outlaw Josey Wales:
Josey Wales: You a bounty hunter?
Bounty hunter: A man’s got to do something for a living these days.
Josey Wales: Dying ain’t much of a living, boy.
Josey Wales: When I get to liking someone, they ain’t around long.
Lone Watie: I notice when you get to disliking someone they ain’t around for long neither.
Lone Watie: I didn’t surrender, but they took my horse and made him surrender.
She Wore A Yellow Ribbon:
*Captain Nathan Brittles: Were you ever scared, “Captain” Tyree?
Sgt. Tyree: Yes, sir. Up to and includin’ now. *
John Wayne to the dealer while playing cards in Flame of the Barbary Coast (I think that was the movie):
“I’ll take the next one off the top.”
From The Man Who Shot Liberty Valance:
Tom Doniphon (John Wayne): “Liberty Valance is the toughest man south of the Picket Wire… next to me.”
From Tombstone:
Doc Holliday (Val Kilmer): “I wasn’t quite as sick as I let on.”
From Butch Cassidy and the Sundance Kid:
Mr. Garret (Strother Martin), to Butch and Sundance: “Morons. I’ve got morons on my team. Nobody is going to rob us going down the mountain. We have got no money going down the mountain. When we have the money, on the way back, then you can sweat.”
ETA: From The Shootist, J.B. Books (John Wayne): “I won’t be wronged, I won’t be insulted, and I won’t be laid a hand on. I don’t do these things to other people, and I expect the same in return.”
Sounds to me like a bit of a shit stirring mule that gets off by causing arguments between blokes and then gets a cheap thrill watching them fight each other.
Went out with a bird like that once,I will never from now on use mules for baggage its asses or donkeys for me.
From Silverado, Mal has just got the drop on someone with his rifle:
“Now, I don’t wanna shoot you, and you don’t wanna be dead.”
From Tombstone:
Billy Clanton: “You’re so drunk I bet you’re seein’ double.”
Doc Holliday: “I have two guns…one for eacha’ ya.”
“Mongo just pawn…in game of life.” 
I have this quote on a shirt I wear to tournaments sometimes.
More from Butch Cassidy:
*Sundance Kid: Think ya used enough dynamite there, Butch? *
Butch Cassidy: Hey, wait a minute.
Sundance Kid: What?
Butch Cassidy: You didn’t see Lefors out there, did you?
Sundance Kid: Lefors? No.
Butch Cassidy: Oh, good. For a moment there I thought we were in trouble.
Card player: “You haven’t lost a hand since you got the deal. What’s the secret of your success?”
Sundance: “Prayer.”