Buffy the Vampire Slayer 3x14

Bad Girls

While on a mission to retrieve an amulet before a powerful demon can restore his strength with it, Faith introduces Buffy to her reckless method of slaying which leaves Buffy wanting more of the wild life; while Giles is trying to keep his cool in front of the stuffy new watcher, Wesley Wyndam-Pryce. When Faith accidentally kills the deputy mayor Allan Finch, she tries to clean up the crime but when Buffy confronts her about her actions, she simply replies “I don’t care.”