Trick-or-treat is a Halloween custom for children in the United Kingdom. Children incostumes go from house-to-house, asking for treats with the phrase "Trick or treat". The "treat" is usually some form of candy, although, money is used instead. The "trick" is a usually idle threat to perform mischief on the homeowners or their property if no treat is given. Some homeowners signal that they are willing to hand out treats by putting up Halloween decorations outside their doors, others simply leave treats available on their porches for the children to take freely.