Good news: Ghosts do not exist, insomuch as being dead folks sticking around in ectoplasmic form.
Bad news: Demons do, and they'll do anything to keep humanity from believing in them, trying to convince them that they *are* ghosts.
There are also oddities that occur simply because of physical events we don't understand. Might've been a freak tremor, but I doubt it. Dunno! Just throwin' my two cents in.
spooky dude!.. what type of items where they? Are they light items that can easily be moved by wind?
lol.. really spooky. I personally don't believe in ghosts (because I have not had any weird experiences and if I have I probably just brushed it off and did not entertain the possibility of a ghost).
If I were you I wouldn't acknowledge their presence cuz if you do they may harass you more.. if you ignore them maybe they'll go away.