Season One: We Saved the World. I Say We Party.
Season Two: We know the world didn't end, cuz...check it out
Season Three: Guys, Take a Moment to Deal with This. We Survived.
Season Four: You Think You Know What's To Come, What You Are. You Haven't Even Begun.
Season Five: She Saved the World. A Lot.
Season Six: There's So Much I Want To Show You
Season Seven: Now Leaving Sunnydale