In this article, I identify "spontaneity" as a significant but poorly-analyzed term in social theory and description through an overview of tensions between varying technical accounts of spontaneity in research literature. In contrast to conceptually-slippery "realist" accounts of spontaneity, I argue for viewing spontaneity ethnomethodologically, i.e., as a contextually-emergent social practice. I suggest two directions for future applications of this approach: first, an ethnomethodological approach to rhetorical analysis of unanalyzed use of the term "spontaneity" in research literature, and second, observational studies of improvisational theatre, a social practice in which orientation toward the production of spontaneity by participants is criterial to the identity of the practice.