lost it

After one of my kids walked around the room with a fart machine (it makes the sound, not the smell), I took it away from him and made him sit down. He apologized. Shortly thereafter I turned around to see him throwing a book at another student.

A textbook.

I told him to see the dean and that he was not to return without a signed note from her. I made him take his backpack with him.

I'm not sure I want to let him back in, even with a note.