Have you ever seen children in costumes and masks ringing doorbells and cring out, "Trick or Treat?" This is a vary common sight every year on October 31. The children are celebrating Halloween.On This holiday children dress up as witches,ghosts,goblins,and other characters.They ring doorbells and ask for a piece of candy or some bubble gum or even a few pennies. It they do not receive a treat. They may play a trick on the person or on the house.