Here's what I consider an interesting thought which occurred to me while re-reading the post about my Casio calculator. I posited a similar scenario a while back, but this one's slightly different, though worthy of contemplation. Ready? What if scientists could transfer someone's life-force into someone else? For example, someone has just died, but their body is kept alive on life-support, and someone else is physically injured to such an extent that their days are numbered. Got that?
And if certain personality aspects of the deceased person occasionally seemed to manifest themselves, would you regard it as coincidence, or fear that the life-force's original owner was trying to reassert themselves?
If you can get your head around the concept (emotionally-speaking), feel free to share your thoughts on the matter.