ABSTRACT In a bid to transform social and political circumstances by instilling outsized fear, terrorists orchestrate atrocities that are unsettling, unanticipated and preclude effective countermeasures. Utilising the critical case of explosive devices – the leading method of ’pure’ terrorism – this article analyses an important, yet underexplored, dimension of this process: the weaponisation of the familiar and everyday. By repurposing ubiquitous, banal artefacts to conceal, manufacture or serve as destructive instruments, terrorists nurture vulnerability, inflict psychic trauma and produce conditions of ontological and social entropy where the surrounding environment appears unstable, corrupted and on the brink of rupture. Rather than a subsidiary dimension of asymmetrical conflict, it is argued that these dynamics are central to terrorism’s organising logic. Accentuating them can, therefore, deepen understanding of the phenomenon’s fearsome effectuation and ability to produce extreme discrepancy between risk and response.