Sustainability scientists have engaged in extensive discussions on ethical ways of doing research and argued on the importance of co-production approaches to counter knowledge extractivism. The specific issue of research fatigue, often associated with knowledge extractivism, and the possible methods to counter it, have however received less attention. This paper seeks to contribute to discussions on ethical ways of doing research by focusing on our experience of using theatre, specifically, Forum Theatre, to investigate divergent perceptions of environmental change and related tensions among selected coastal communities in Kenya and Mozambique. We argue that Forum Theatre constitutes an ethical method for sustainability scientists for four reasons: (i) it allows to co-produce knowledge with participants; (ii) it facilitates horizontal exchange; (iii) it creates joyful moments; and (iv) it enables the transmission of skills that remain with participants beyond project durations. The paper engages with these four themes, first theoretically and then proposing a reflection based on our project experience. In the last section, we warn against some of the limitations of the approach.