Okay, Captain Euro Goes to Sunnydale is brilliant. Mac captures the voices of the characters absolutely perfectly (and incidentally, the political commentary is pretty decent too):

XANDER: So this is what you do, huh? You roll into town in your tights and insult people with your nose-up-in-the-air attitude? I need any insulting done, I can get it at home, I don't need your contribution.

SPIKE: And I'll insult him.

XANDER: Right, Spike can insult me. Lord knows, that's the only way he ever gets to hurt anyone anymore.

SPIKE: Mate, don't push your luck.

XANDER: Or what, you'll have a headache at me? Bring it on, blondie.

Hilarious.