This article adopts a qualitative–explanatory approach and, drawing on library-based sources, examines Iranian humorous folk tales associated with the numskull type. It seeks to describe and analyze the structural, thematic, and narrative-world characteristics of these tales. In conventional classifications of folk tales, including the Aarne–Thompson system and Marzolph’s typology, numskull tales have largely been categorized on the basis of motifs and themes, and no clear criteria have been provided for their internal and typological analysis. The present study aims to reinterpret and classify these tales based on their narrative logic and intrinsic features.The findings indicate that tales related to numskulls can be examined in three main domains: tales of the numskull type, tales of the “wise madmen” (ʿoqalāʾ al-majānīn), and other closely related humorous types. Furthermore, numskulls, according to the type and degree of cognitive error and their mode of engagement with the world, can be divided into three categories: simpletons, gullible individuals, and naïve persons. The world of these tales is fundamentally a real world; however, from the perspective of numskull perception, it is transformed into an inverted and improbable world—a world in which the relation between knowledge and ignorance is reversed and conventional standards of rationality are destabilized. This article seeks, through a reconsideration of conventional classifications of folk tales, to propose a more coherent framework for analyzing the numskull type and their narrative world.