THE pumpkin is carved (雕刻), the costumes are prepared and there’s a big bowl of candy waiting by the door. Halloween is lurking (潜伏) in the wings, ready to fly down for another night of trick-or-treating, haunted (闹鬼的) houses and frights (惊吓) for all. But where did these annual rituals (仪式) come from? We answer your Halloween questions in this guide to the scariest night of the year.