School Hard (Season 2, Episode 15):

Cut to the library. The table is full of books, and Xander, Willow and Jenny are looking through them doing research.

Giles: Spike. That's what the other vampire called him? That's a little unorthodox, isn't it?

Buffy: Maybe he's reformed.

Giles: Perhaps he went by another name in... times past.

Jenny: Well, whoever he is, we'll need all the help we can get come this Saturday.

Xander: So, this night of St. Vigeous deal. If they're gonna attack in force, aren't we thinkin' vacation?

Willow: We can't run, that would be wrong. Could we hide? I mean, if that Spike guy is leading the attack, (shudders) yeeehehehe.

Giles: Well, he can't be any worse than any other creature you've faced.

Angel: (suddenly appears) He's worse. (they all look at him) Once he starts something he doesn't stop until everything in his path is dead.

Xander: Hmm. So, he's thorough, goal-oriented.

Buffy: We were at the Bronze before. Thought you said you might show.

Angel: You said you weren't sure if you were going.

Buffy: I was being cool. C'mon, you've been dating for, what, like, two hundred years? You don't know what a girl means when she says maybe she'll show?

Willow: Wow, two centuries of dating. If you only had two a year, that's still, like, four hundred (Buffy gives her a look) dates with
four hundred different... (looks at the mace on the table) Why do they call it a mace?

Giles: Uh, we do have slightly more urgent matters to discuss.

Buffy: Yeah, like keeping my mom away from Principal Snyder tomorrow night?

Jenny: And not dying Saturday.

Giles: Angel, do you know if this Spike fellow goes under any other name?

They all look where he was, but he has disappeared. The library doors finish shutting.

Xander: Okay, that's it. I'm puttin' a collar with a little bell on that guy.