In this paper, I introduce a new species of elusive reason–reasons that it is impossible for an agent to act, or be motivated to act, for–and I show how this kind of elusive reason undermines a plausible claim about normative reasons, the Motivational Constraint. To defend the existence of this new kind of elusive reason, I respond to the objection that our intuitions are tracking another normative or evaluative phenomenon, such as reasons to have certain affective responses or reasons for (...) others to act. In addition, because accepting the new kind of elusive reason requires affirming the claim that S acts for a reason p only if S regards p as a reason to A, I develop an account of what it is for S to regard p as a reason to A. Finally, as part of arguing for the former claim, I argue that the idea of being moved to A for a reason p entails the idea of being moved to A in light of p, which itself entails the idea of regarding p as a reason. (shrink)