It's Halloween! Only here's the trouble. JUnie B.JOnes is afraid to got trick-or-treating. 'Cause what if witches and monsters are really real? and what if pumpkins with sharp teeth can eat your feet? and don't even get her started on the candy corn problem. So how is Junie B. Supposed to enjoy this scary holiday? But then--with a little help from a friend--she gets an dea for a costume guaran…