This paper offers an approach to understanding dramatic social change, entwined with belief revision and shifting knowledge. It explores the interplay between rapidly changing material and ideological conditions through the concept of a rupture. Ruptures are breakdowns in existing social and epistemic practices and relations: periods which call into question what is normalized, such that something else can grow through the cracks. Ruptures do not guarantee any particular replacement, but rather facilitate the emergence of new practices and understandings of the world. Ruptures thus create conditions of possibility for people to explore new social relations and ideas. To develop this idea, this paper draws on Franz Fanon’s writings on the Algerian anti-colonial revolution (1954–1962), as a paradigmatic rupture, as well as two smaller-scale ruptures: the student-worker movements over 2015–2016 in South Africa (#FeesMustFall) and Brazil (the primavera secundarista). In their respective contexts, each movement has substantively challenged prevailing practices and understandings that had been hegemonic.