This is a study of my dramatized narrative based on a true story of what took place in a mathematics class in an international school setting. My narrative includes the exploration of a mathematical "mistake" and the discovery of newly emergent problems. The drama, commentary, and reflections provide a close examination of the conduct and consequences of teaching and learning. This study is of relevance to educational practitioners with regard to teacher noticing and action, the construction and undoing of disability and selfhood, excellence and social justice in teaching, transformative teaching, and individual and cultural change.