Children dressed as all kinds of horrors rang the neighbor's doorbell door to door and asked for candy. There are many theories about the source of activities, and the two widely circulated versions are:

1. In ancient times, Celtic children would collect firewood from house to house to make a fire.

2. In the middle ages, in the custom of "comforting the soul" on Halloween, children had to go door to door to ask for "bread of the soul". The "soul cake" is actually a kind of bread dessert covered with raisins. Every time the children get a piece of this cake, they should pray for the deceased relatives and friends of the cake giver. These prayers will help their relatives and friends find their way from purgatory to heaven. Children will also sing a song "Bread of the Mind", which is similar to the modern "trick or treat, trick or treat, give me something delicious".