When on the last page of What Is Philosophy?, Deleuze and Guattari (1995: 218) claim that philosophy needs a non-philosophy, this statement is the result of a long engagement with the problem of thinking in society. It is this engagement that we intend to reconstruct in this article. By developing an original definition of thinking after Heidegger, Deleuze is able to claim that philosophy is not the only ‘thinking’ discipline. Our point of departure is Deleuze's constant reference to a phrase (...) from Heidegger's lecture course What Is Called Thinking?: ‘We are not yet thinking’ (Deleuze 1988: 116, 1989: 167, 1994: 144, 2002: 108; Deleuze and Guattari 1995: 56). This phrase points to the demand for a new distribution of the relation between philosophy and its outside. The purpose of this article is to trace Heidegger's influence on Deleuze's definition of thinking and to raise two points. First, Deleuze borrows some elements of Heidegger's definition of thinking to further his own understanding of politics as an involuntary practice. For both, the question of thinking is political. Second, by departing from Heidegger, Deleuze can democratise the definition of thinking, beyond its confinement to philosophy, by turning to cinema. Deleuze calls cinema the art of the masses because it brings the masses in contact with external signs. Finally, in the last part of this article, we will discuss how Deleuze raises stupidity (and not error) as a transcendental problem that should be constantly fought. In this way, we hope to shed light on how Deleuze moves from Heidegger's question ‘what is called thinking?’ to the problem of stupidity and shame. (shrink)