Every Halloween, millions of surrogate zombies, vampires, and goblins take to the streets, looking to fill the fluorescent orange brainpans of their plastic pumpkins with individually wrapped, fun-sized candies. It seems like a custom immemorial, but trick-or-treating wasn't always an inseparable part of Halloween: in fact, little more than 60 years ago, many Americans had never even seen a trick-or-treater.
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