My first thought was "send them out of class, with a note to parents, you want your son back in my class teach him some manners first'...........then I thought, it depends on where the school is ....... USA - I'd just call Securirty ...........Thailand, I'd have a big stick in my hand (fdor protection) and the note - give it to them, and step back. Yep, I'd probably lose my job. BTW I am not and never have been a School Teacher, but have taught Troops on all corners of the earth, some real badass folks - and learned the hard way, you sytand your ground 99.5% will back down, it's the other half % you have to worry about, like bringing a gun back to school with them. Peace