A ghost is someone who hasn't made it - in other words, who died, and they don't know they're dead. So they keep walking around and thinking that you're inhabiting their - let's say, their domain. So they're aggravated with you. ↗
Nothing is so galling to a people not broken in from birth as a paternal, or, in other words, a meddling government, a government which tells them what to read, and say, and eat, and drink and wear. ↗