In the amnesia puzzler's pre-9/11 heyday, blank-slate protagonists from Christopher Nolan, David Lynch and Shane Black rewrote their own stories. In every case, their histories ended up rosier and nobler than the depraved violence just beneath the surfaces of "Memento" (2001), "Mulholland Drive" (2001) and "The Long Kiss Goodnight" (1996). So let's retrace our steps through this forgetful subgenre, shall we? Surely, we'll find out we're good people.