BEHAVIOUR IS shaped by the forbidden. Murder, nakedness, infidelity, non-heterosexuality, and obscenity are but a few examples of the ways in which human activity is normatively constrained. Such acts are stigmatised as taboo. That is, these ideas exist as socially constructed expectations that actors should not engage in, permit, and in some cases even acknowledge certain behaviours that have been deemed unacceptable. In short, taboos are what we should not do. While such expectations are subject to reinterpretation, re-justification, and also Machiavellian claims that actions characterised as taboo can be considered permissible under specific conditions of use, life is framed within a series of moral and normative anticipations, or ‘rules’, as to which acts are socially tolerable. Likewise, this concept of the taboo extends beyond the personal and into the political arena. Within international politics the notion of the taboo is manifest in numerous issues and controversies including the legitimacy of intervention, the violation of state sovereignty, targeting of non-combatants, and – the focus of this study – weapon prohibitions, where certain types of armament are considered so excessively offensive that their possession and use are intentionally and institutionally delegitimised....