volatile

So I think my apartment is haunted. Me and all my roommates have had different experiences that when we put them together, make us think this.

First off my bedroom door slams shut all the time. I have no idea why.

Then the other night my roomate and I were watching TV and the balcony just slid open on its own.

My roommate's girlfriend refuses to shower here because she was here alone one day showering and said she could just tell there was someone in the bathroom with her, and she could see a shadowy figure, but when she looked there was no one there.

Also, at night it sounds like people are constantly walking through the halls, and not only have me and my two roomies heard it, but 3 different friends who have stayed here have told us about it. even sometimes when I'm here alone during the day I swear I hear people going in and out through to apartment and realize no one is here. We're on the top floor of the building, and are the only ones on this floor, so it's not neighbors.

Are we just being paranoid or could there be something more?