<P> One evening , Ali convinced the others to support her plan to get revenge on Jenna 's stepbrother , Toby Cavanaugh , for spying on them while they were changing . Ali snuck into the Cavanaugh 's yard , grabbed one of Toby 's fireworks , and accidentally launched it into his tree house . Alison sees Toby and Jenna together and accidentally set the firework off into the tree house , blinding Jenna and burning it down . Alison blackmails Toby into taking the blame for the incident and he is sent away . Later the girls would come to call the infamous incident `` The Jenna Thing . '' </P>
<P> One evening , Ali convinced the others to support her plan to get revenge on Jenna 's stepbrother , Toby Cavanaugh , for spying on them while they were changing . Ali snuck into the Cavanaugh 's yard , grabbed one of Toby 's fireworks , and accidentally launched it into his tree house . Alison sees Toby and Jenna together and accidentally set the firework off into the tree house , blinding Jenna and burning it down . Alison blackmails Toby into taking the blame for the incident and he is sent away . Later the girls would come to call the infamous incident `` The Jenna Thing . '' </P>
pretty little liars how did jenna go blind
pretty little liars how did jenna go blind
firework
firework