From Season 2 of "Buffy the Vampire Slayer":

BUFFY: So, what did you and Principal Snyder talk about anyway?

JOYCE: Principal Snyder said you were a troublemaker. And I could care less. I have a daughter who can take care of herself. Who's brave and resourceful and thinks of others in a crisis. No matter who you hang out with or what dumb teenage stuff you think you need to do, I'm gonna sleep better knowing all that.

BUFFY: About how long till this wears off and you start ragging on me again?

JOYCE: Oh, at least a week and a half.

BUFFY: Very cool!