Arghh! Why do they insist it was a pencil box, when it was a heavy metal case with a lock! Although unlocked, it appeared to be a strong box and nothing like any pencil box I've eve seen. That thing looked like a bomb case! That kid was out to terrify his classmates and teacher, setting off the alarm in the middle of class. This was no "science" experiment! It was a muslim doing what they do, spreading terror (on the school-day after 911).
I’m surprised no one has pointed out (maybe I just haven’t seen it) that when you plug it into the wall socket and have those exposed wires, you have something that is very dangerous. 120 Volts can kill a person. That contraption looks very unsafe.
Because it is a pencil box like this.