According to Colbert, the ritual of trick or treating is a type of social contract. One must say "Trick or Treat" if one wants candy. The "Trick or Treater" represents a Spirit or Demon sent to terrify the resident with "Eldritch horror", the resident in turn will fend the spirit off with the supplication of sweets representing earlier cultures animal sacrifices to the Elder Gods, a treat to stop your trick.
Halloween has its roots in a Christian holiday, All Hallow's Eve, where people would put a candle in a hollowed out gourd to get a blessing from God.
Halloween, is a child's introduction to the barter system, rudimentary capitalism, take stock of one's candy trawl.
The Amish have faceless dolls, cause all are equal in the eyes of the Lord, and to avoid "graven images". Zippers are considered a form of ostentation.