From relative obscurity in the 1990s, hypnotherapy has become a major industry in contemporary Indonesia. This article examines its tremendous surge in popularity, and the subsequent trajectories of its vernacularization. It shows the hypnosis boom to have been underpinned by the introduction of a distinctive “30% theory, 70% practice” seminar format, structured in such a way as to allow mass‐market consumers to experience themselves as hypnotically efficacious. With such efficacy proving unsustainable outside the seminar context, Indonesians reached for and developed alternative conceptions of “hypnosis” that allowed them to continue as effective hypnotherapists. Such material demonstrates the value of incorporating a theory of interactional affordances into anthropological models of cultural transmission and globalization. [efficacy, hypnosis, globalization, Indonesia, interaction, psychotherapy]