I think I would have these reactions:
When the rocking horse moves, I would move around on the floor to see if vibrations
caused it...
When the book fell I would think... okay, someone is probably messing with me...
Then when the ghost jumps, I would probably crap my pants....
Then if I didnt soil my pants I might decide to hang around, and I would think, "Okay someone is really messing with me... where's the camera?"