The Shrubstitute
Class, you most definitely did not hear your teacher right. You thought you heard him say that you will have a substitute while he was away for the week. But no, he mentioned that you would have a Shrubstitute Treacher. The Shrubstitue Treacher is here to watch your every move.
He doesn’t speak. He doesn’t blink. He doesn’t even move. But you can be sure that he sees all and will be reporting back to your teacher every slip-up that occurs while he’s away. Keep on your best behavior kids, or else the Substitute will rat you out!