Zach Roberts, right, looms behind as he waits for his daughter, Anna Roberts, 4, to put on her horn to complete her unicorn costume before going lunch hour trick-or-treating on Halloween, Wednesday, Oct. 31, 2018, in downtown Seattle. Halloween, celebrated on the eve of the Christian festival of All Souls, is historically viewed as a time when souls could wander freely across the earth and evil spirits, the devil, and witches were at their most powerful. (AP Photo/Elaine Thompson)