How do ghosts work?

Ghosts don't work.  That is what gives them so much time to go around scaring people.  If they had a day job they would be to exhausted to walk around the attic dragging chains.  Some do seem to have jobs however.  For example, Ebenezer Scrooge was visited by three ghosts; the ghosts of Christmas Past, Present, and Future.  However,  it seems that this is only seasonal employment for the unholy specters. 

Part of the difficulty comes from trying to employ a ghost.  They can only type with extreme difficulty, and are entirely unsuited for manual labor.  They would be ideal for checking for corrosion in pipes, but how would they hold the flashlight.  It should also be noted that ghosts don't have much need for money.  They don't eat, they don't need a mortgage to move into a new house, they can't operate cars. 

Ghosts are the disembodied spirits of the dead, and no one  is sure exactly what they are composed of.  Ghost busters claims they are ectoplasm, but fails to describe what ectoplasm is.  Ghost busters is also hardly an authoritative documentary on the subject. 

Many other documentaries on ghosts, such as "Sixth Sense," "Ghost," and "Heart and Souls" suggest that ghosts just hang around waiting for closure.  Just like that ex who just won't go away.

It has also been reported that it is just all in your head.   People want to believe, so they project ghosts into all the noises and oddities that occur in their lives.  Often this type of person is referred to as 'paranoid.'  But remember, just because your paranoid, it doesn't mean you are wrong.