I agree with what your are saying. Weird things happened when someone I know for fears died, like for example they start to talk about seeing/talking with our ancestors etc.. etc.. before they died the next few days. I mean I experienced this twice when two people I know died a few days after. However, I can't assure that it is true to the fact that there are ghosts in this world. Perhaps, it might be just the complexity of how our brain operates whenever we are near death. Who knows?!