perfect 10th year student, the

A construction devised and built by our physics teacher, Mr Ward, out of a cardboard box, with a large paper speech bubble reading "Yes Mr Ward!".
Our physics teacher would ask it questions like "Will you pass your exams?", and then answer himself in a high pitched voice, saying "Yes Mr Ward!", while jiggling the cardboard box with his hand.
One story that proves that the insanity of teachers isn't always entertaining.