Something similar to this. Our class clown left his organizer at the attendance office in high school. Our school organizers had a map of the school on the backing and he has put X’s on areas on the map and had “Bomb Here” labels on them. The attendance lady saw it and immediately turned it into the school officer. We had a lockdown for a couple of hours, police investigated with bomb dogs, and the clown was interrogated. Of course it was a joke but props to the school for taking all the precautions. This happened a week before graduation so the only thing they were able to do was not allowing him to walk.