This paper develops the notion of metonymy scenarios by exploring the social and cognitive dimensions of various creative uses of metonymy in a collection of digital banners created for the Global Climate Strike movement. The paper argues that the banners exploit existing metonymic relationships to activate dominant anthropocentric discourses in society, and to subvert them via processes of recontextualisation and reappropriation, in order to challenge system conventions and normative attitudes regarding climate change. The literature to date has not adequately considered metonymy as a dynamic and scenario-activating cognitive operation, nor has it thoroughly investigated the relationship between metonymy and irony. However, the data analysed here show that several creative uses of metonymy, including twice-true metonymy, metonymy in combination with metaphor, and the juxtaposition of different metonymies are markers of what this paper posits as metonymic mininarratives or scenarios.