Giles:  Xander’s taken to teasing the less fortunate?

Buffy:  Uh-huh.

Giles:  And, there’s been a noticeable change in both clothing and demeanor?

Buffy:  Yes.

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. Course, you’ll have to kill him.

Buffy the Vampire Slayer, Season 1: Episode 6 – “The Pack”