Halloween is one of the most exciting days of the year for students. Imaginations--and children--run amok, fueled by thoughts of pumpkins, trick-or-treat plans, and sugar highs. But at school, their teachers dread the yearly shenanigans, and this year, the students have started celebrating a day early. With princesses running a tiara trade ring in the girls' bathroom and a laser sword battle among fourth-grade space rangers, the kids are quickly taking...