Because as Mc(Steve)Job says.
You're a funny little cunt.
And by funny, read "mentally challenged".
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@Clear Glass, you should deck the cunt.
Check with the teachers or admin if they have a policy about students breaking other student's property. Some schools do, and they'll be able to get the kid to pay the cash. It's total bullstuff if this tool gets away with it, but not much else you can do without blackmailing the richardhead.