Once Upon a Time in the West begins with three gunmen waiting for a train for over 10 minutes with basically no dialog or any action. When the train finally arrives, their encounter with the mysterious stranger still takes four more minutes, with one of the most badass dialogs ever performed:
In King Arthur, right before the Battle of Badon Hill, Arthur speaks to the Saxon leader Cedric, telling him to "Know this face, Saxon, as it will be the last thing you see before you leave this earth." With a somewhat grudging respect, Cedric mutters as he walks off, "Finally, a man worth killing."
The first Blade, when Whistler blows into the room where Blade is being held captive, "Catch you fuckers at a bad time?!"
And later on, before Blade finishes off Frost, "Some muthafuckas always trying to ice skate uphill."
How can you forget the very last line of the movie spoken in Russian? "Catch you at a bad time, tovarisch?"
True Grit, just before Rooster guns down Ned Pepper and his cohorts in a four-on-one horseback gunfight. "Fill your hand, you son of a bitch!"
Frequently subverted in Big Trouble in Little China. Most of Jack Burton's attempts to offer a Pre Ass Kicking One Liner seem to precede him either getting his own ass whipped, or putting himself out of action by doing something stupid. Ironically, his successes tend to be preceded by not-very-clever lines, such as saying, "What the hell!" right before he finally nails Lo-Pan (though even that attack initially misfires).
And some other pretty awesome quotes: "Give them nothing! But take from them, everything!", "This is where we hold them! This is where we fight! This is where they die! Remember this day, men, for it will be yours for all time.", "Spartans! Ready your breakfast and eat hearty, FOR TONIGHT, WE DINE IN HELL!!!", "No retreat, no surrender. That is Spartan law. And by Spartan law, we will stand and fight...and die. A new age has begun: an age of freedom! And all will know that 300 Spartans gave their last breath to defend it!", "Spartans! Prepare for glory! ", "Persians! Come and get them!" (in response to an appeal to lay down their weapons),"We're in for one wild night.", "Spartans! Push!" Needless to say, 300 was full of ridiculously awesome lines. If you saw only Ho Yay on the last two, my work here is done.
Truth in Television, some of those — although English doesn't really have an exact analog to how "Molon labe" should be translated. Roughly speaking, what is being rendered as "Come and get them!" is more of a "You can have them if you can get to them." The modern English equivalent would be something along the lines of "You can have my weapon when you pry it from my cold, dead fingers." The line isn't really a Pre Ass Kicking One Liner, it's a Pre Getting My Ass Kicked One Liner, as was the other famous line from Plutarch: "Their" (meaning the Persians) "arrows will darken the sun!" "Then we shall fight in the shade."
The Spartans didn't get their asses kicked at Thermopylae. True they lost, but they did NOT get their asses kicked.
Straw Dogs. "OKAY! You've had your fun! And if you don't clear out now... there'll be real trouble. I mean it." Another example is "This is where I live. This is me. I will not allow violence against this house."
An explanation for those who don't remember the 1950s: Indy's line was one of President Eisenhower's campaign slogans.
The Last Boy Scout: Bruce Willis tells Damon Wayans, "This is the 90s, you can't just smack a guy in the face. You have to say something clever first. Like if you hit him with a surfboard, you say, 'Surf's up, pal!'"
Harry Callahan: Hey! You forgot your fortune cookie! (crumbles cookie, takes slip of paper) It says, "You're shit outta luck, punk'". (commence ass-kicking, .44 Magnum-style)
Terry Pratchett parodies that first one in Night Watch. After going back in time, Vimes attempts to pull a "Me, Mr. Burleigh and Mr. Stronginthearm," version with a crossbow, only to discover, to his great disappointment, that he's still got decades to wait before the first Burleigh & Stronginthearm crossbows will be invented. And it was SUCH a good line, too.
A Clockwork Orange: "Ho ho ho! Well if it isn't fat, stinking, billygoat Billyboy in poison! How art thou, thou globby bottle of cheap, stinking chip oil? Come and get one in the yarbles — if ya have any yarbles, ya eunuch jelly, thou!"
Mac: Scared motherfucker? Well, you should be. 'Cause this Green Beret is gonna kick your big ass! Matrix: I eat Green Berets for breakfast, and right now I'm very hungry! Cindy:(hiding under a table) I can't believe this macho bullshit...
Matrix: Remember when I said I would kill you last? ... I lied.
The German dub arguably manages to make it even more badass by matching the Agent's line "Only human" by Trinity's "Only an Agent".
Also in Revolutions, where the Merovingian is attempting to get the main characters to give him something he wants in order for him to get Neo out of the Matrix. Trinity, with at least two dozen mooks pointing guns at the heads of her, Morpheus, and Seraph, simply says "I don't have time for this shit." and then begins beating the crap out of several of the bodyguards, catching a pistol and holding it against the Merovingian's head.
Ripley's "Get away from her, you bitch!" in Aliens.
As well as "Let's rock!", followed by a long burst of Smart Gun fire.
Nicholas Angel:(riding into town carrying an obscene amount of weaponry) Morning.
One of the protagonists in Race for the Yankee Zephyr (1981) has a habit of describing the eating habits of the crocodile in disgusting detail to everyone he meets. When he and his friend are stopped at a roadblock of armed mooks, they begin to recite this description in unison — then as the mooks are looking at each other in bemusement launch a Groin Attack.
Gran Torino: Clint Eastwood's character has a ton of amazing one liners, but some of the best Pre-Asskicking One-Liners are, "Ever notice how you come across somebody once in a while you shouldn't have fucked with? That's me." and "Yea? I blow a hole in your face and then I go in the house... and I sleep like a baby. You can count on that. We used to stack fucks like you five feet high in Korea... use you for sandbags."
Anchorman: The Legend of Ron Burgundy has the great quote by Veronica Corningstone (Christina Applegate): "Because I am good at three things: Fighting, screwing, and reading the news. I've already done one of those today, so what's the other one gonna be? Huh?"
Public news really deserves some credit for their sheer bad-assness.
"Public news is taking time off for its pledge drive to kick some ass. No commercials! NO MERCY!"
Kick-Ass: It should be no surprise this has many, but probably the most famous is Hit-Girl's. Wherein she starts by inverting the normal order of things by killing the boss first, then addresses the mooks: "Okay you cunts...let's see what you can do now." *counts foes and watches to see which one makes a move first* "Eenie...meenie...minie..." *a mook goes for a weapon* "MOE!"
Capt. Malcolm Reynolds: Ah hell, I'm a fan of all seven. But right now, I'm gonna have to go with wrath.
In The Avengers, the Hulk - seemingly a script-writer favorite for awesome one-liners - gets one during the climax when the large alien whale-ship-thing is bearing down on the group
Captain America: Dr. Banner? Now might be a really good time for you to get angry
Bruce Banner: *looking at Cap* That's my secret, Cap. I'm always angry. *turns and effortlessly morphs into the Hulk in about five seconds, crushing the ship with one punch*
V for Vendetta: "The only thing you and I have in common is that we are both about to die".
Just after getting shot for more than ten seconds by an entire squad of fingermen wielding guns, V delivers a short one before slaughtering them all. Plus points for it being only moments after the quote above in a sort of one - liner combo.
V: My turn.
Really, V delivers quite a few of these.
V: [Just before killing several fingermen] Penny for the Guy?