Seeing Red - S6-E19
Xander: I think it's the "daddy" thing that's throwing her. 'Cause incest? Not that sexy.
End Of Days - S7-E21
Xander: Hey, party in my eyesocket and everyone's invited!
Xander: What's with the hand wave? You see that? Does that, like, mean something?
Willow: It's code. I think it breaks down to 'choo-choo!'
Anya: It probably means to follow him. That, or wait here for him.
Willow: [whispering.] Ask him.
Xander: [yelling.] Hey, Riley? What's the [hand gesture.] all about?
Riley: It means yell real loud so the vampires who don't know we're coming will have a sporting chance.
Xander: See, now he's all mad and sarcastic.
Willow: It's because you were doing all that yelling, Mr. Stealthy-pants.
Spike: Death is on your heels, baby. And sooner or later, it's gonna catch you. And part of you wants it. Not only to stop the fear and uncertainty, but because you're just a little bit in love with it.
Xander: Hey now - play nice, fellas, or you'll break our concentration.
Anya: Which means no protection spell...
Xander: And Willow will make sure you two boneless chickens are skinless, too.
Andrew: Then what? You think your Li'l Witch buddy's gonna stop with us? You saw her! She's a truck driving Magic Mamma. We've got maybe seconds before Darth Rosenberg grinds everybody into Jawa burgers, and not one of you bunch has the midiclorians to stop her.
Xander: You've never had any tiny bit of sex, have you?
Tabula Rasa - S6-E8
Spike: Oh, listen to Mary Poppins. He's got his crust all stiff and upper with that nancy-boy accent. [Everyone looking at him.] You Englishmen are always so... [pauses.] Bloody hell! [Ticks off on his fingers.] Sodding, blimey, shagging, knickers, bollocks, oh God! I'm English!
Giles: Welcome to the nancy tribe.
Xander: Are we overlooking the possibility that she may be very attracted to me? ... She's possessed.
[Buffy accidently attacks Xander, and Xander jumps back.]
Xander: Man, Buffy. My life just flashed before my eyes. I gotta get me a life.
Chosen answer: He had larangitis and because of the shooting specifications they had to have him shoot the scene with a bad throat, they then re-recorded his lines and dubbed them. At various points during the scene and indeed the episode you can see him touch his throat or rub it.