Anonymous intruders repeatedly entered online lessons at an upper secondary school in Tuscany, Italy, talking over the teacher and showing extremely violent films and pornographic videos; students disconnected on teachers’ instructions, and smaller episodes occurred in other regional schools. The school head informed local postal police and law enforcement, and wrote twice to parents, the second time after a further intrusion in March, warning that the intruders needed a student to share the lesson link and that students who did so risked a criminal complaint.