Trick-or-treating is a customary celebration for children on Halloween. Children go in costume from house to house, asking for treats such as candy or sometimes money, with the question, "Trick or treat?" The word "trick" implies a "threat" to perform mischief on the homeowners or their property if no treat is given. The practice is said to have roots in the medieval practice of mumming, which is closely related to souling. John Pymm wrote that "many of the feast days associated with the presentation of mumming plays were celebrated by the Christian Church." These feast days included All Hallows' Eve, Christmas, Twelfth Night and Shrove Tuesday. Mumming practiced in Germany, Scandinavia and other parts of Europe, involved masked persons in fancy dress who "paraded the streets and entered houses to dance or play dice in silence".