This paper discusses a form of metaphorical creativity that involves the introduction of 'unrealistic' scenarios for rhetorical purposes in expository and argumentative texts. It primarily accounts for the nature and function of this form of creativity in terms of Fauconnier and Turner's (2002) notion of Blending, with some references to Conceptual Metaphor theory (Lakoff and Johnson 1980, 1999). It shows that a proper account of the analysed textual extracts needs to include the role of genre in the construction and interpretation of texts, and allows for differences in meaning construction between writers and readers, and between different groups of readers.