Well, the question is: did Leonard really kill his wife? Can we trust 'Johnny G.'at any point? If Leonard lost his  memory when his wife was murdered, how does he remember he lost his memory (when it doesn't seem to be written on his body)? Was Leonard's wife a diabetic?? What part, if any, of the Sammy Jankis story is true? Why doesn't Leonard keep a pad and pen on him at all times (I guess he keeps forgetting)? If Leonard did kill his wife in a version of the Sammy Jankis story, at what point in his story did he lose his memory? Without memory is there past or future? Is ignorance bliss (can anyone ever know)? 