Worse than that: we'd get charged a lot of money and expelled.

[He shuddered as if that was a fate worse than death. Which kind of is to him.]

But it's special because the mirrors are magic artifacts. So it'd be a lot of trouble if they broke. I accidentally broke a chandelier along with some classmates on my first day and that was a big deal. And that doesn't even do anything except look nice. I hate to imagine what would happen with something like the mirror...