The Spooktacular History of Halloween
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Trick-or-Treating in Costumes
Since Samhain marked the end of the old year and the beginning of the new one, the Celtics believed the past and the present were closely linked during this time, allowing the lines between the living and dead to be blurred and the spirits of the deceased to mingle with the living.
They believed that visiting ghosts would disguise themselves in human form and knock on doors asking for money or food. If they were turned away empty-handed, the homeowner risked angering the spirit and being cursed or haunted.
Another Celtic myth was that dressing up as a ghoul or ghost would fool any evil spirits so that the spirits would not try to take their soul.