LOL don't do that, otherwise you whooooooooole school will have seeeerious problems.. :P It happened to me many years ago, it wasn't even someone of our class, but teachers said "we were the last class who used the computers" so they ALWAYS believed it was someone from our class who stolen a mouse :P they maked us crap until the end of the year for that, a fucky 0.1? ball mouse LOL
Well this ain't France, here no one will notice, and in Russia no one would care :D
But it was just a joke anyway.