Honestly, when I were a lad you designed and built your own elint stuff, none of this shop-bought crap! Also the motive - better grades? How very American. We thought it more fun to bug the girl's sixth-form room for out petty teenage amusement.
Sadly, it was rumbled when one of our own blabbed, thus proving what all computer security experts have known all along: it is ultimately the human users you can't trust.