Halloween originated as a celebration connected with evil spirits. Witches flying on broomsticks with black cats, ghosts, goblins (丑妖怪）and skeletons（骷髅） have all evolved as symbols of Halloween. They are popular trick-or-treat costumes and decorations for greeting cards and windows. Black is one of the traditional Halloween colors, probably because Halloween festivals and traditions took place at night. In the weeks before October 31, Americans decorate windows of houses and schools with silhouettes of witches and black cats.

Pumpkins are also a symbol of Halloween. The pumpkin is an orange-colored squash, and orange has become the other traditional Halloween color. Carving pumpkins into jack-o'lanterns is a Halloween custom also dating back to Ireland. A legend grew up about a man named Jack who was so stingy that he was not allowed into heaven when he died, because he was a miser. He couldn't enter hell either because he had played jokes on the devil. As a result, Jack had to walk the earth with his lantern until Judgment Day. The Irish people carved scary faces out of turnips, beets or potatoes representing "Jack of the Lantern," or Jack-o'lantern. When the Irish brought their customs to the United States, they carved faces on pumpkins because in the autumn they were more plentiful than turnips. Today jack-o'-lanterns in the windows of a house on Halloween night let costumed children know that there are goodies waiting if they knock and say "Trick or Treat!"