I think a lot of ghosts are suffering from OCD. Cause it seems like a lot of this unfinished business is opening and closing doors, turning the faucet on and off. 

It's like you know you're really suffering when your disease gets in the way of doing things that you enjoy with people you love. Ghost are like, right at heaven, knocking on the pearly Gates with all their famiy waiting on the other side and theyre like, I think I left the oven on, I think the garage door is open, lemme just go back and check