I would say the cold vampire slayer in "The Wish" atau when she was over the influence of Willow's spell in "Something Blue" atau even when she was a vampire... don't really remember wich episode that was... Hope i could helped!
1) S03E14 Bad Girls — When she was trying to be lebih like Faith.
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2) S02E01 When She Was Bad — When she was nasty to Xander and Angel.
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3) S05E01 Buffy vs. Dracula —
DRACULA: "Perhaps, but your power is rooted in darkness. anda must feel it."
BUFFY: "No. anda know what I feel? Bored."
That bored line is such a Faith-ism, doesn't feel right for Buffy at all.
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4) S03E21 & 22 Graduation hari 1 & 2 — The cold way Buffy has to get tough to fight Faith, and the way she tells the Mayor how she stabbed her:
BUFFY: "I took it from Faith. Stuck it in her gut. Just slid in her like she was butter."
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5) S02E05 Reptile Boy — When Buffy goes to the frat party with Cordelia and lies to everyone.
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6) S02E20 Go ikan — When she's hanging out on the beach, and then later with the swim team jocks.
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One more...quite possibly one of my favourite scenes from the entire series —
7) S01E12 Prophecy Girl —
BUFFY: So that's it, huh? I remember the drill: one slayer dies, the seterusnya one's called. I wonder who she is. Will anda train her? atau will they send someone else?
GILES: Buffy, I...
BUFFY: Does it say how he's gonna kill me? Do anda think it'll hurt?
[Angel walks towards her]
BUFFY: Don't touch me! Were anda even gonna tell me?
GILES: I was hoping I wouldn't have to, that there was some way around it. I...
BUFFY: I've got a way around it: I quit.
GILES: It's not that simple.
BUFFY: I'm making it that simple: I quit! I resign! I-I'm fired! anda can find someone else to stop The Master from taking over.
GILES: I'm not sure that anyone else can. All the signs indicate...
BUFFY: Signs? Read me the signs! Tell me my fortune! You're so useful, sitting here with all of your books, you're really a lot of help!
GILES: No, I don't suppose I am.
ANGEL: I know this is hard.
BUFFY: What do anda know about this? You're never gonna die!
ANGEL: anda think I want anything to happen to you? Do anda think I could stand it? We just gotta figure out a way.
BUFFY: I already did. I quit, remember? Pay attention!
GILES: Buffy, if The Master rises...
BUFFY: I don't care! I don't care. Giles, I'm 16 years old. I don't wanna die.