Life's a Show and We All Play a Part

Buffy: Do you think any other Slayers ever had to go to high school?
Xander: It's no biggie. You'll have a nice soire'e. The parents will love it. As long as nothing really bad happens between now and then, you'll be fine.
Buffy: Are you crazy? What did you say that for? Now something bad is gonna happen!
Xander: Whadaya mean? Nothing's gonna happen.
Willow: Not until some dummy says, 'as long as nothing bad happens.'
Buffy: It's the ultimate jinx!
Willow: What were you thinking? Or were you even thinking at all?