On Halloween, children go door-to-door saying "trick or treat" and receive candy, with threats of tricks if none is given. The holiday has origins in Ireland but is celebrated in America through costumes, decorating houses and pumpkins from local farms, and parties where both children and adults dress up in costumes ranging from witches and monsters to astronauts and tigers. Families carve designs like faces into pumpkins and place candles inside to create Jack O'Lanterns.