When spontaneous expressions such as smiling or crying have been at issue in Anglophone philosophy of action, the touchstone has been Donald Davidson’s belief-desire account of action. In this essay, I take a different approach. I use Elizabeth Anscombe’s formal conception of intentional action to capture the distinction and unity between intentional action and spontaneous expression. Anscombe’s strategy is to restrict her inquiry to the class of acts to which a certain sense of the question ‘Why?’ has application. Applying Anscombe’s strategy to an area she did not consider other than by contrast, I argue that spontaneous expressions are subject to a different but intimately related why-question. Both questions elicit non-observational knowledge. But where the question posed to intentional actions opens up a means-end order (an order of practical reasoning) this is not true of the corresponding question for spontaneous expressions. Our explanations of our own spontaneous expressions have conceptual and normative dimensions, but they do not display an inferential order. Anscombe, taking a formulation from Aquinas, describes practical knowledge as the cause of what it understands. I conclude by arguing that this formulation also holds true of our understanding of our own smiles and episodes of crying.