Samhain step from guising to playing pranks". Playing pranks at Samhain is recorded in the Scottish Highlands as far back as 1736 and was also common in Ireland, which led to Samhain being nicknamed "Mischief Night" in some parts. Wearing costumes at Halloween spread to England in the 20th century, as did the custom of playing pranks, though there had been mumming at other festivals. At the time of mass transatlantic Irish and Scottish immigration, which popularised Halloween in North America, Halloween in Ireland and Scotland had a strong tradition of guising and pranks. Trick-or-treating may have come from the custom
Samhain the Fomorians; in this way the Morrígan acts as a sovereignty figure and gives the victory to the Dagda's people, the Tuatha Dé Danann. In "Aislinge Óengusa" ('The Dream of Óengus') it is when he and his bride-to-be switch from bird to human form, and in "Tochmarc Étaíne" ('The Wooing of Étaín') it is the day on which Óengus claims the kingship of Brú na Bóinne. Several sites in Ireland are especially linked to Samhain. Each Samhain a host of otherworldly beings was said to emerge from Oweynagat ("cave of the cats"), at Rathcroghan in County Roscommon. The Hill of