How did "Trick or Treat" begin at Halloween?
The custom of trick-or-treating is thought to have originated as a ninth-century European custom called “souling.” On November 2nd, All Souls Day, early Christians would walk from village to village begging for “soul cakes,” made out of square pieces of bread with currants. The more soul cakes the beggars would receive, the more prayers they would promise to say on behalf of the dead relatives of the donors. At the time, it was believed that the dead remained in limbo for a time after death, and that prayer, even by strangers, could expedite a soul’s passage to heaven.