In Welcome To The Jungle, when asked what his profession is, Harry replies he works in "accounts payable" because he "makes sure everyone gets what's coming to them." Later, when he's going off to confront the Big Bad we get this exchange:
Will: But what if you need help? Where will you be?? Harry: Balancing some books.
In Small Favor, Harry comes up with this after Michael is shot.
Shagnasty: You are not a holy man. You do not follow the Old Ways, or the Binding Ways. You have no power over me.
Listens-To-Wind: Don't plan to bind or banish you, old ghost. Just gonna kick your ass up between your ears.
In Changes, from either God or an Archangel, via Murphy:
False gods! Pretenders! Usurpers of truth! Destroyers of faith, of families, of lives, of children! For your crimes against the Mayans, against the peoples of the world, now will you answer! Your time has come! Face judgment Almighty!
In Ghost Story, we get this line from Mortimer right before he obliterates the Corpsetaker's ghost:
"But it seems to me, you half-wit, that you probably shouldn’t have left a freaking ectomancer a pit full of wraiths to play with."
Some old man told me you live and learn. Well, I have lived, and now I've learned that the edge of a sword is infinitely long. I've also learned how to make damn good yoghurt, although this is not a skill I intend to employ today. Shall we go get' em, boys?
Vimes to Sybil in Jingo: "Just going out to kick some arse, dear." Of course, the fight doesn't start immediately afterwards.
The Last Battle: "This is my password. The light is dawning, the lie broken. Now guard thee, miscreant, for I am Tirian of Narnia."
Watership Down. Bigwig's Determinator speech, "My Chief Rabbit has told me to defend this run, and until he says otherwise I shall stay here," scares the hraka out of the Efrafans, who mainly respect brute strength and have assumed up to this point that Bigwig was the Chief Rabbit of his warren. If he's not, there must be an even bigger Bad Ass Bunny around somewhere. Has emotional meaning as well, since Bigwig swore never to call Hazel the Chief Rabbit until the day he stops fighting.
"But no living man am I! You look upon a woman. Éowyn I am, Éomund's daughter, and you stand between me and my lord and kin. Begone, if you be not deathless! For living or dark undead, I will smite you if you touch him."
Smug Snake: After all, what do you think the odds are of you managing to defeat fifteen of my best? Merlin: Better than average.
This was also used by Mick Dundee.
"What are the odds of you getting out of here with that coat?"
Knife through a mohawk
"Better than average."
In Illium, Zeus and the Greek pantheon stand ready to destroy the combined Greek and Trojan armies (long, spoilery story), and then all of humanity. He delivers the classic "Any last words" line in a godly fashion... to which Achilles responds "Surrender now, and we'll spare your goddess's lives so they can be our slaves and courtesans." Despite being a fairly stupid (but awesome) asshole in this story, that may be the best response to such a line, ever.
Rastignac's "It's between you and me now, Paris!" in Le Père Goriot.
Mat Cauthon: Carai an Caldazar! Carai an Ellisande! Al Ellisande! (For the honor of the Red Eagle! For the Honor of the Rose of the Sun! The Rose of the Sun!)
Mat Cauthon: Dovie'andi se tovya sagain. (It's time to toss the dice.)
Mazrim Taim: Asha'man, Kill!
The Elenium's confrontation between King Wargun and Sparkhawk, when the King is pulling rank and Sparhawk doesn't feel like cooperating.
King Wargun: I have a thousand picked men at my back! Sparhawk: How many are you prepared to lose?
The Sten series book Fleet of the Damned provides this: "We are now attacking a Tahn battlefleet. There are at least two battleships with the fleet. We are going to kill them." Ironically, Sten didn't consider this an example, and in fact felt it would be a waste of time to give an "England Expects." He was commanding an obsolete heavy cruiser, and they did destroy one state-of-the-art battleship, and cripple the other beyond repair.
After Quick Ben unleashes half of his warrens (sources of magical power) to blast Korbal Broach through a wall, Bauchelain, partner of the aforementioned Korbal Broach, notes that Quick Ben's power is most impressive, but that, in retrospect, he ought to have saved at least half his warrens.
"But Bauchelain," replies Quick Ben, "I did."
He then blows Bauchelain through the wall too.
In the Codex Alera series by Jim Butcher, Aldrick ex Gladius, one of the recurring antagonists, is widely renowned as the second best swordsman in the known lands, only being passed up by one other. He often uses this fact to unnerve his opponents, and his skill ensures that it's hammered in quickly enough.
Aldrick: The only man to best me with a blade was Araris Valerian....and you aren't Araris.
Subverted, however, in the first book. The person he's attacking isn't Araris...but he's very close by. Aldrick's brief Villainous Breakdown when Araris intervenes is a sight to behold.
Also in the fourth book, in response to an antagonist complaining about being made to chase all over the place for "two pathetic sneaks." the third protagonist present Gaius Sextus who was hidden out of sight of the antagonist says "Three." Cue Curbstomp Battle.
From True Grit by Charles Portis (and both film versions), we have this exchange before the final showdown:
Rooster: I mean to kill you in one minute, Ned, or see you hanged at Fort Smith at Judge Parker's convenience. Which'll it be?
Ned: I call that bold talk for a one-eyed fat man!