Giles: Xander's taken to teasing the less fortunate?
Giles: And, there's been a noticeable change in both clothing and demeanor?
Giles: And, well, otherwise all his spare time is spent lounging about with imbeciles.
Buffy: It's bad, isn't it?
Giles: It's devastating. He's turned into a sixteen-year-old boy. Of course, you'll have to kill him.