Trick-or-treating is a Halloween tradition where children dress up in costumes and go door-to-door asking for treats such as candy. The tradition originated from the 16th century practice of going house-to-house collecting food on Halloween. In North America, trick-or-treating became popular in the late 1920s and involves children saying "trick or treat" at each home. Apple bobbing is a Halloween game where apples float in water and players try to catch one in their teeth without using their hands.