 A different issue is that if a compatibilist concedes SK when switches are relevant, she may be conceding too much (Goldberg 2006a). For there is a persistent Cartesian intuition that armchair self-knowledge should be unaffected by skeptical hypotheses about the external world. Following Meditation Two, even if an evil demon is deceiving me, it still seems I can know what I am currently thinking. Yet the slow switch experiment suggests that this Cartesian intuition is mistaken. For if a slow switch hypothesis is relevant, then even a relevant alternatives epistemology demands that we discriminate water thoughts from twin water thoughts. Yet one is unable to do so from the armchair. So apparently, some deviant hypotheses about the external world can undermine armchair knowledge of one’s own occurrent thoughts, contra the Cartesian intuition. Something important about armchair self-knowledge may be lost.