Good or bad?
Every coin has two side, so the other side is that all ghosts are not bad. Yes, so in this cruel world there are some friendly ghost that exist. Not every ghost wants to harm you.
Ghost like smell of lemon
I don’t know how they come to know about this fact. May be in a deep discussion between our researchers and ghost, ghost will be asking for more than two lemon soda or water.
Sleeping time of ghosts
Ghost never sleeps as they don’t need rest. They are stuck for so many reasons. Lucky ghost, the only thing they do is to scare shit out of people.