Part of the increasing efforts to render teachers impotent. If a teacher were to lay even a single finger on any person in the class this would be met with a chant of "G.B.H., G.B.H., G.B.H." by the pupils, each letter punctuated with both fists banged onto the desk. Hopefully, the repetitive mantra-aspect of the chant (not to mention the mob rule aspect) would worm its way into the teacher's confidence, and make them panic. One famous and long-lasting rendition of this 'anthem' was when our Geography teacher, 'Clicker' Clark, grabbed my arm and punched me in the back. I probably deserved it.