It's exciting to think about being anyone you choose to be, creating a costume and acting out that person for a day.
Many people think that choosing to be a witch, a ghost, a skeleton, or a vampire is harmless fun.
They don't know the roots of these ideas and are unaware of the potential destructiveness of dabbling with evil spirits. Halloween's deepest roots are decidedly pagan. Long ago, in what is now France and Britain, the Celts observed the end of summer with pagan rites. They believed a lord of death sent evil spirits into animals. The animals roamed around all winter playing terrible tricks on people.