*nod* Well a brain injury (object in the brain) can change a person's persosnality. A man about a century ago survived a large nail (a small spike) being driven into his forehead. He lived, but went from a quiet church-going polite man, to a foul mouthed bastard because the spike damaged a certain part of his brain that controlled personality.<br/><br/>That's why I'm leaning towards a experimental virus or nanite.