Buffy the Vampire Slayer, Season 6

Dawn:
You want me to name you?

Buffy:
Oh, that's sweet, but I think I can name myself. I'll name me... "Joan".

Dawn:
Ugh.

Buffy/Joan:
What? Did you just "ugh" my name?

Dawn:
No, I just... I mean, Joan, it's so blah.

Buffy/Joan:
I like it. I feel like a "Joan".

Dawn:
Fine, that's your purgative.

Buffy/Joan:
"Prerogative".

Dawn:
Whatever, Joan.

Buffy/Joan:
Whatever, Umad.

Buffy/Joan/Dawn:
[unison.] Boy, you're a pain in the... / Boy, you're bossy!

Dawn:
Do you think we're-

Buffy:
Sisters?

[They smile and hug each other.]

Spike:
[watching them hug] [to Giles] You never showed me affection like that... [Giles looks at him, bewildered] I'd wager.