The Running Man:
“What happened to Buzzsaw?”
“He had to split.”
Commando:
(After killing main bad guy)
“Let off some steam.”
Just some more classic Ahnold.
I also like Sandra Bullock’s lines from Demolition Man:
“Looks like he matched his meat. You really licked his ass.”
I kinda like an Arnold line from terminator 2.
Tear Gas everywhere, Arnie walking through it with a grenade launcher. He yanks the gask mask off of a random swat team guy, and shoves the launcher into his arms. “Here, hold this.”
The best line in Unforgiven, in my humble opinion, is:
Little Bill: I’ll see you in hell, William Munny!
Munny: Yeah. gunshot
My favorite line from Unforgiven:
Scofield Kid: “I guess they had it comin’, didn’t they?”
Munny: “We ALL got it comin’, kid.”
I like Wesley Snipes, from <i>Blade 2</i>.
“Keep pushing, asshole.”
Eastwood’s got a lot of great lines.
In ‘High Plains Drifter’ the hotel owner’s wife says: “I knew you were cruel, but I didn’t know how far you could go.” Eastwood: “You still don’t.”
“What’d you say your name was, stranger?” “I didn’t”
The Good, the Bad, and the Ugly–The Ugly: (reading the Bad’s note) “See you soon, idi…idio…idio…” Eastwood takes the note: “Idiots, it’s for you.”
Dollar movie–“Get 3 coffins ready,…my mistake. four.”
“Rohos on one side, Baxters on the other and me in the middle–crazy bellringer was right, a lot of money to be made in this town.” Then: “Mexican government on one side and the American government on the other and me in the middle–too dangerous.” As he rides out of town with a shit load of cash and everybody dead.
Also, “Why are you doing this?” “$500”
From The Big Sleep:
Eddie Mars: Convenient, the door being open when you didn’t have a key, eh?
Philip Marlowe: Yeah, wasn’t it. By the way, how’d you happen to have one?
Mars: Is that any of your business?
Marlowe: I could make it my business.
Mars: I could make your business mine.
Marlowe: Oh, you wouldn’t like it. The pay’s too small.
Marlowe: My, my, my. Such a lot of guns around town and so few brains!
Two favorites:
“Are you going to bark all day little doggie, or are you going to bite.”
“I find your lack of faith— disturbing”
While not exactly a witty one liner (more of a no liner actually) one of my faves is the huge smile on the Terminators face when he picks up the minigun in T2.
The Score: Robert De Niro {worldly-wise jewel thief} to Edward Norton {hot-shot kid who has just failed to double-cross him}: “Lemme ask you somethin`, Jack. When did you first start to think you were better than me?”
And from Mad Dogs {can`t remember whose line it was - Richard Dreyfus?}: “When it comes to not giving a fuck, you guys are just dabblers.”
After swearing, at the kid’s insistance, that he won’t kill anyone, the Terminator shoots a gate guard in the kneecaps. As the guy is sitting there yelling in pain, Arnie says, “He’ll live.”
And how on earth have we not mentioned, “Hasta la vista, baby!”
Austin Powers: Not the time to lose one’s head.
Vanessa: No.
Austin Powers: That’s not the way to get ahead in life.
Vanessa: No.
Austin Powers: It’s a shame he wasn’t more headstrong.
Vanessa: Hmm.
Austin Powers: He’ll never be the head of a major corporation.
Vanessa: Okay, that’ll do.
Austin Powers: Okay.
I don’t know, I always took the AP scene to be Vanessa making fun of his cheesy lines, not trying to help him decide on the best one.
IIRC You only live twice Bond flips someone into a pool of pirahnas and as the guy is being shredded he utters, “Bon Appetit.” 
Its so cool and laidback, Connery definately set Bond up as the hardest, coolest motherf***er the spy world has ever seen.