Samhain to snack-size: how trick-or-treating happened.

Every October 31st, small masked strangers arrive at your door, issue a ritual threat, and are paid off in sweets. Nobody involved finds this strange. It took roughly two millennia of layered tradition to make that transaction feel normal, and almost every layer is still visible in it if you know where to look.

The layers, oldest first

The threshold night — Samhain, the old Celtic festival at the end of October, closed the harvest and opened winter — a boundary night when the veil between the living and the dead was held to thin. Communities lit great fires; people left offerings of food and drink for whatever might wander. The core transaction — something sweet in exchange for goodwill from the uncanny — is already here.

Souling — In medieval Britain and Ireland, the church's All Souls' season absorbed the old date. The poor went door to door offering prayers for the household's dead in exchange for 'soul cakes' — small spiced rounds. Door, performance, pastry: the format is now recognizable.

Guising — In Scotland and Ireland, children took over the circuit — in disguise, so wandering spirits couldn't recognize them, performing a song, a verse or a trick to earn their reward. The costume and the performance clause enter the contract. A guiser who wouldn't perform got nothing; ask any Scottish grandparent.

The crossing — Nineteenth-century emigration carried the whole bundle to North America, where it mixed with harvest festivals and an enthusiastic local appetite for pranks. By the early twentieth century the pranking arm of the tradition had grown expensive — soaped windows, gates off hinges, worse — and towns wanted a treaty.

The treaty — The phrase 'trick or treat' shows up in North American newspapers by the 1920s and 30s: a child's protection racket, named plainly. Organized, candy-funded trick-or-treating spread as exactly that — a civic bargain that converted mischief night into a supervised sugar circuit. After wartime sugar rationing ended, the candy industry made the bargain permanent.

The snack-size era — Mid-century suburbs perfected the machine: porch lights as open-for-business signs, 'fun size' bars engineered for volume distribution, UNICEF boxes adding a charitable arm in the 1950s. The offering to the dead had become, definitively, a line item in the grocery budget.

So tonight, when a four-foot ghost threatens your household unless paid in chocolate, observe the protocol with respect. You are the latest signatory to one of the oldest treaties still in force — and the porch light is your side of the seal.