okay... so the paranormal investigators are gonna be at my house in a few minutes. :] I'll let people know what happens after, but brief rundown:

Lots of voices that i'm not sure where they are coming from.
I saw a misty figure watching me.
It locked a door from both sides...
We hear footsteps and the sounds of doors opening and closing.
It has actually slammed a door closed when everyone in the house was downstairs, went upstairs and all the doors were closed, when we usually leave them all open.
It lets the cat into closed bedrooms.
And the cat freaked out one day when we were talking about the door being locked, as if someone was standing there listening. (completely abnormal behavior for him.)