Ghosts: Depends on your religion sorry, didnt think this through yet. If by ghosts you mean dead people that still have emotions and remain on earth, i'm not sure. it COULD depend on your religion, for example, christianty suggests that dead people's spirits go to heaven. 2nd edit: damnit joeboy caught me again :c
Big Foot: If so, it would be some freak science experiment to make a bear have the capability to stand on 2 legs. and make him grow 4 feet.