A Tough Teacher

A teacher of my friends injurred back and had a plaster to the upper part of the body. For his first Day of the word, always with the troops under his shirt, it was to teach the unruly class. Stepping confidence the noise in the classroom, he opened the window as far as possible. Only then a strong breeze made his tie flap. Experiments, the bars, He has a blackboard rubber hammer and a large turning capacity by its tie in his chest.