Halloween Symbols - part 2

The main event of modern US-style Halloween is trick-or-treating, in which children dress up in costume disguises and go door-to-door in their neighborhood, ringing each doorbell.

According to this custom, children greet each homeowner with the cry "Trick or Treat," suggesting that some sort of prank will be played unless treats are provided.

Formerly, trick-or-treaters vandalized the house if no treats were produced or if the treats met with their disapproval. Since the early 20th century, however, the threat of tricks has been largely ceremonial.