Sure, but how are you at rendering a scowl to unruly students?
I just commit random acts of violence against my students; the fear of arbitrary punishment keeps them on their toes.
I must tell you my students are always good. But when I teach I wear big long skirts, big shirts/sweaters, flat shoes, no makeup. I look awful, but I want my students paying attention not to me, but what am teaching – and it works.