I'm a collector. And I'm not allowed to have weapons.
Really, what kind of irresponsible adult would say, "oh, your going to school? remember to bring materials to endanger the lives of everyone around you."?
The kind I have always wanted, but anyway, the idea is that he doesn't "waste" his money on things that don't make sound. Instead he saves for something that does. Also he doesn't really get what kind of school it is. He's pretty slow on the uptake.
Although it would be hilarious if we started and the teacher said "first class is biology. We will be talking about single celled..."
you know, like a real school would.