In Scotland and other parts of Britain and Ireland, the tradition of going house to house collecting food at Halloween goes back at least as far as the 16th century, as does the tradition of people wearing costumes at Halloween. There are many accounts from 19th-century Scotland and Ireland of people going house to house in costume at Halloween, reciting verses in exchange for food, and sometimes warning of misfortune if they were not welcomed. In North America, trick-or-treating has been a Halloween tradition since the 1920s. The earliest known occurrence there of the Scottish Halloween custom of "guising" – children going from house to house for food or money while disguised in costume – is from 1911, when children were recorded as having done this in Ontario, Canada. While going house to house in costume has long been popular among the Scots and Irish, it is only in the 2000s that saying "Trick or treat" has become common in Scotland and Ireland. Prior to this, kids in Ireland would commonly say "" at the doors of homeowners. The activity is prevalent in the United States, Canada, the United Kingdom, the Republic of Ireland, Australia, Puerto Rico, and northwestern and central Mexico. In the last, this practice is called "calaverita" (Spanish diminutive for "calavera", "skull" in English), and instead of "Trick or treat", the children ask, ""¿Me da mi calaverita?"" ("Can you give me my little skull?"), where a "calaverita" is a small skull made of sugar or chocolate.