 As a second worry, if Oscar’s memory contents shift, has he really forgotten nothing? A case can be made that the memory shifts indeed constitute forgetting (Brueckner 1997a). For even though memory offers up a similar substitute content, it seems clear that Oscar fails to recall something about water. Yet a failed attempt at recall just means that Oscar “forgot.” If so, then it is premise (b) rather than (a) which is the culprit in the memory argument. (Even so, there may remain a different sense in which Oscar does not forget; Brueckner 1997a, n. 21; see also Kraay 2002).