"PANCAKES!" you howl, testing the theory that it doesn't actually matter what you howl, so long as you get the correct volume and murderous inflection. "PANCAAAAAAAAAAKES!" Your foe scampers away in fear, lending credence to your hypothesis.
Baldur's Gate has quite a few used by both villain and hero, even if we discount the fact that every character has his own Battle Cries.
CommanderShepard is full of these. If we were to list all the one-liners s/he says we would probably have to give Mass Effect its own section. AGAIN!
Emily Wong got one in a Twitter feed. She was in an aircar, unarmed, bleeding, with a Reaper right in front of her. She had only one choice. Her last message: "You want to see how a human dies? At ramming speed." A shame she almost certainly accomplished nothing with it.
We have no beginning. We have no end. We are infinite. Millions of years after you civilization has been eradicated and forgotten, we will endure. We are legion. The time of our return is coming. Our numbers will darken the sky of every world. You cannot escape your doom. Your words are as empty as your future. I am the vanguard of your destruction. This exchange is over.
I AM SOVEREIGN! AND THIS STATION IS MINE!
You exist because we allow it. And you will end because we demand it.
Sephiroth: Well, that's an interesting sword you're carrying. (indicating Sora's weapon) Donald: It's the Keyblade. Sephiroth: I see. So that's a Keyblade. (to Sora) And I suppose you must be its chosen wielder. Sora: So what if I am? Sephiroth: I wonder if it won't change it's mind, once I defeat you.
Zack Fair, a non-villain example: "...and above all...protect your honor...AS SOLDIER!! COME AND GET IT!!!" To a whole army.
Dissidia: Final Fantasy has all characters say something when the battle starts, and a good part of the time it'll be this trope, or some sort of mocking comment about the opponent. The prequel Dissidia 012 went further with custom introductory quotes for storyline battles where both character speaks. For example, this gem from the Final Boss:
Garland: "I will grant you true and utter annihilation!" Lightning: "Bring it on! I don't need a second chance!"
From Chrono Cross: "Now, let love bleed! Darker and deeper than the seas of hell!"
Gene from God Hand has a few of these, even more irrelevant than usual because he doesn't give a damn about his opponent. "You can wax on wax off all you like, I'm still kicking your ass" is probably the most well-known. Probably the most amusing is the one word he spouts in response to the Mad Midget Five's Team Shot:
Elvis' "I'm gettin' hungry, hombre!"
Team Fortress 2 has those whenever an ubercharge is used on a Heavy. "Is good time to run cowards!"
NOW IS COWARD KILLING TIME!
I AM BULLET-PROOOOOOOF!! *Commence ass-kicking*
The Soldier's Buff Banner when used also makes him utter one of his battle cries.
Also, every character on both teams at the very start of a round. They can also be used at any time through the "Battle cry" voice command.
This is part of the reason why Duke Nukem is such a Badass, even though he lifts a few lines from other sources. Example: "Come on out, Morphix. There's only two ways this can end, and in both of 'em, you die!"
Even the manga adaptation cannot avoid such badass lines. One noticeable example is Sora taking out an out-of-control Magnum Loader, while also adding a shout out to the film that the world he is in was based on.
The beginning of a Gears of War multiplayer match normally has someone saying something.
In Fire Emblem7 before taking down the Big Bad, all characters that are taking part in the battle get to deliver one, or at the very least the group they're fighting for. The best is Canas' "Let this battle be forgotten by history, that is all I ask."
Hector gets this beauty of a quote when facing the boss of his version of chapter 11:
Hector:You see, I'm about as angry as I've ever been. I doubt that even a dozen of you could slow me down. Prepare to die!!!
In Awakening, all characters have quotes when they land a critical hit or activate a skill. The line generally viewed as the best belongs to Frederick.
And the lesser known "What is this place?" "Keep your eyes peeled!" *gun cocking sounds*
In Blood Omen 2, before the first boss, the boss in question says that Kain will die if he fights the Sarafan Lord, Kain says that may be true, and then adds, "But you will never know how it ends, Faustus, for I will bury you first of all."
If you haven't played the other games before Defiance, it does a great job at explaining Kain to you in the first five minutes.
Sarafan:"Surender, fiend, and we promise you an easy death."
Which on the Internet is often paraphrased as "KING OF HEROES, DO YOU HAVE ENOUGH SWORDS?"
Killer7 has Harman's first lines in the game "Good night child, it's past your bed time."
And Dan's classic, "I went to see the Devil, now it's your turn."
World of Warcraft: Each of the Alliance & Horde faction leaders will deliver one of these if you attack them.
One attack on the Horde capital city of Orgrimmar featured this especially well. The raid organisers were targetting Thrall, warchief of the orcs, and forgot (as many do on both factions) that the leader of the trolls also spends most of his time in Thrall's keep. They charged Thrall at full speed, only to hear from behind, "Dis gonna be de last mistake you make, mon" seconds before Vol'jin the Shadowhunter tore their formation apart, starting with the healers at the back.
During the Gunship Battle we have "You DARE board my ship? Your death will come swiftly." if you're on Horde and "What's this then?! Ye won't be takin' this son o' Ironforge's vessel without a fight!." if you're on Alliance.
During the Wrathgate cinematic, Saurfang the Younger delivers this gem:
Rise up, sons of the Horde! Blood and glory await us!
The standard Battle Cry of "FOR THE HORDE!" or "FOR THE ALLIANCE!" can work as one of these.
In Metal Gear Solid, Snake and Otacon are trapped inside a building while the Big Bad circles it in an armed helicopter. Snake tells Otacon to go fix the elevator so they can move on, and Otacon asks Snake what he intends to do. Snake's response? "I've got to go and swat a noisy fly."
Metal Gear Solid also had Gray Fox's: "A cornered fox is more dangerous than a jackal!" though he died shortly after saying it.
Persona 3 has a lot of great lines after you knock down an enemy and get a chance to have all four characters gang up on it, such as Akihiko's "Oh, I've been waiting for this!" and Junpei's "Come back here, you son of a-!"
"I make my living as an elevator attendant but... I know several effective ways of inflicting pain. Don't worry, I'm not as fragile as I look. Try to kill me... if you can."
And its Spear Counterpart: I am he who governs power. I should pose a challenge, even for you. I advice that you do not hold back. Fight as though you intend to kill.
Every Shadow boss in Persona 4 starts with "I am a Shadow, the true self..."
Lloyd and Kratos team up to do this at the Iselia Ranch. As Forcystus emerges from the front doorway after shooting Lloyd, Kratos says very calmly that he is disappointed that this is how the great Desian hero Forcystus meets his end. He doesn't need to do anything though, as Lloyd does the asskicking part for him WHEN HE SHANKS HIM. Kratos has some choice lines when he finishes off Kvar ("Feel the pain" *slash* "Of those inferior beings" *slash* *sheathes sword* "as you burn in hell") and before right after you kill Remiel in the first time in the tower of salvation and Kratos show up and as the fight starts he say "Do you earnestly think you can defeat ME?"
Darksiders: "You can look at me in the eye when I kill you."
Red Faction: Guerrilla: Alec Mason cracks quite a few of these during the game, but the most epic one happens in the end, when the Red Faction is about to shoot down the Hydra, the largest warship ever known to man.
Kobel: This is Admiral Kobel of the EDF Hydra. What is your status?
Mason: Just fine, Admiral, but yours is about to go red.
The game itself delivers one in Episode Twelve, when Asura goes into his Berserker Form.
Achievement Unlocked: "Heads Will Roll"
Neverwinter Nights' NPCs and PCs have voice that sets will occasionally have them say one of these once they attack an enemy.
Dark Hero: "NO QUARTER!"
Reserved Guardian: "Let the earth take you!"
Confident: "I'll handle this one!"
Dramatic: "Your death has been too long delayed."
In Neverwinter Nights 2, this ultimately fails with Kaelyn the Dove, for which she can explain why. And this is one of her One Liners.
Kaelyn: "Oh... you... oh, I don't know any profanities! How embarrassing..."
EVE Online gives us this from the trailer for the latest expansion, called Incursion. This particular one-liner precedes the collective ass-kicking of a galactic cluster, 4 established empires and their respective naval forces, and the player-base.
Sansha Kuvakei: "I will vanquish your fear, and commute your flesh...to dust."
Wing Commander Prophecy has Maestro's: "I think we haven't been properly introduced yet, I'm Maestro, you're dead,"
Played quite nicely in Portal 2, although the person the one-liner was directed at never actually got their ass-kicked;
GLaDOS: I hope you brought something stronger than a portal gun this time. Otherwise, I'm afraid you're about to become the immediate past president of the Being Alive Club. Ha Ha.
GLaDOS: "This next test involves turrets. You remember them, right? They're the pale spherical things that are full of bullets. Oh wait, that's you in five seconds. Good luck."
GLaDOS: "I suppose we could just sit in this room and glare at each other until somebody drops dead... But I have a better idea. It's your old friend, deadly neurotoxin. If I were you, I'd take a deep breath. And hold it."
GLaDOS: "Well, this is the part where he kills us." Wheatley: Hello! This is the part where I kill you. Chapter 9: The Part Where He Kills You. BGM: The Part Where He Kills You (Achievement Unlocked: The Part Where He Kills You; Subtitle: This is that part)
Shaker: "Oh my! Our guest has no sense of style! But I suppose a guest is better than no guest at all! Welcome, welcome! Come, come now, do stay a while and enjoy yourself!"
Ray: "You there! Wait! So you're the scum that's causing all the commotion! Thanks to you, I had to drag my ass all the way out here! It's hot and stuffy in here... My suit's getting dirty... This is the pits! Sorry, but I have to kill you now... I'm kinda in a hurry to get back home..."
Tiberius: "You again... So, you want me dead? I'm going to enjoy this battle!"
Diablo 3 gives us this one.
Diablo:"Even in the heart of heaven, angels can still feel fear."
Warhammer 40,000: Dawn of War has many. Each expansion adds more, and basically half the lines in the series are these.
Apothecary: "Death or healing... I care not which you seek."
Dreadnought: "At last, back to war."
In Fallout 3 and Fallout: New Vegas, the Mr. Gutsy robots say these almost exclusively: "Every day is a good day to die!" "Kill'em all and let GOD sort 'em out!" "Looks like it's my lucky day." "Take THAT, you commie bastard!"