Rogue
-'Never knew what hit him.' -Ghost unit, Starcraft
-'Ha ha! You fool! You fell victim to one of the classic blunders! The most famous is 'Never get involved in a land war in Asia,' but only slightly less well known is this: 'Never go in against a [Rogue] when death is on the line!' - Vizzini, The Princess Bride
-'Anyway, I've got good news and bad news. The bad news is, I won initiative, so you guys get a sneak attack each. The good news is, I don't have to bother thinking up a second half to that joke, 'cause you're all dead now.' -Haley, Order of the Stick
Fighter
-'I'm going to duel him left-handed.'
'You know what a hurry we're in!'
'Well, it's the only way I can be satisfied; if I use my right, over too quickly.' -The Princess Bride
Paladin
-'[God], I have failed you for twenty years. Now our misery can end. Somewhere, somewhere close by is a man who can help us. I cannot find him alone. I need you. I need you to guide my sword. Please, guide my sword.' - Inigo, The Princess Bride
Cleric
-'O merciful God, I have such need of Your mercy now. Not for myself, but for my [friends], for this is truly their hour of need. Deliver them from their trials ahead and I will pay You a thousand fold with any sacrifice You ask of me. And if in Your wisdom, You should determine that sacrifice must be my life for theirs; so that they can once again taste the freedom that is so long been denied to them, I will gladly make that covenant. My death will have a purpose. I ask no more than that.' - King Arthur (film)
Barbarian
-'Tell me, is being a complete and utter moron a prerequisite for the class, or a side effect of taking a level?'
'Let Gortok answer your question with a question: Who will be the moron after Gortok's white-hot anger crushes your little body into a mangled bloody pulp while Gortok sings a jaunty tune to accompany your unanswered cries for mercy?' - Order of the Stick
Bard
-'Some thoughts have a certain sound, thought being equivalent to a form. Through sound and motion, you will be able to paralyze nerves, shatter bones, set fires, suffocate an enemy or burst his organs. We will kill until no [enemy] breathes [our native land's] air.' - Paul Atriedes, Dune (film)
-'Never trust [someone] that grins all the time. [They're] up to something.' - Pyramids (discworld)
Warlock
-'Don't say another Goddamn word. Up until now, I've been polite. If you say anything else - one word - I will kill myself. And when my tainted spirit finds its destination, I will topple the master of that dark place. From my black throne, I will lash together a machine of bone and blood, and fueled by my hatred for you this fear engine will bore a hole between this world and that one. When it begins, you will hear the sound of children screaming - as though from a great distance. A smoking orb of nothing will grow above your bed, and from it will emerge a thousand starving crows. As I slip through the widening maw in my new form, you will catch only a glimpse of my radiance before you are incinerated. Then, as tears of bubbling pitch stream down my face, my dark work will begin. I will open one of my six mouths, and I will sing the song that ends the Earth.' -Tycho, Penny Arcade