The disruptive girls/women in the class, a gang of six or so, manipulate the system but not for gain, just for laughs and power. Streetwise, they seem unable to see what they can gain long term from study. These fit neatly into the psychopathic spectrum of personality traits but are not. This so-called trait, the diagnosis of sedate armchair theorists and psychiatrists, ignores cultural and environmental matters, as well as harm/benefit calculations common to us all. The latter are merely perceived differently.