 When first championing the memory argument, Boghossian (1989) noted the reply from relevant alternatives, yet maintained that the slow switch experiment still shows a conflict between EXT and SK. For one can imagine cases where slow switching is a relevant alternative. And in those cases, one could not rule out this possibility just from the armchair. Even the relevant alternatives account denies the externalist armchair self-knowledge in such a scenario. Still, why does this reveal a problem with our self-knowledge? If slow switching actually occurred on a regular basis, it would be a relevant alternative that could not be excluded from the armchair, and the externalist would lose SK. But to acknowledge a possible scenario of this sort does not mean that EXT and SK are incompatible (Warfield 1992). It shows merely that if EXT is true, self-knowledge is not necessarily within reach from the armchair.