Halloween is a holiday celebrated on the night of October 31. Traditional activities include trick-or-treating, bonfires, costume parties, visiting "haunted houses" and carving jack-o-lanterns. The ancient believed that on October 31, the boundaries between the worlds of the living and the dead overlapped and the deceased would come back to life and cause havoc such as sickness or damaged crops. The festival would frequently involve bonfires. It is believed that the fires attracted insects to the area which attracted bats to the area. These are additional attributes of the history of Halloween. Masks and costumes were worn in an attempt to mimic the evil spirits or appease them. Trick-or-treating, is an activity for children on or around Halloween in which they proceed from house to house in costumes, asking for treats such as confectionery with the question, "Trick or treat?" The "trick" part of "trick or treat" is a threat to play a trick on the homeowner or his property if no treat is given.