why so serious? I can't say I'm surprised, considering that this is the age of school-shootings and the clinically insane white youth that perpetrates these overwrought crimes (which are then blamed on music, television, and video games--never the idiot parents). They probably thought he was really taking pointers from TDK.
Still...
He's a kid. Kids do stupid shit all the time. Unless he has a record of violence, isn't expulsion a little much?