When a teacher at a school in northwestern Russia tried to wake a 16-year-old student sleeping at his desk, he muttered: ¡°You¡¯ll regret this.¡±

After the lesson, he grabbed her from behind, pressing what she thought was a pen into her throat. As blood trickled down her fingers, she realized it was a medical scalpel.

¡°Next time, I¡¯ll stab you,¡± he said.