Anyone believe in Ghosts ?

I've never seen a ghost but I did see and hear a door knob move one night as if someone was trying to open the door. The door was on the interior of the house and nobody was around. I investigated the room in which the door led to and nothing was there.

And if anyone has ever had an obe then you would know the answer as to whether there are spirits or not. I was skeptical until it happened to me one night.

They say there are at least 11 dimensions that exist. We sense only 3 of those dimensions in our normal state of being. That leaves at least 8 higher dimensions undetected by us normally. If those dimensions are more complex to our understanding then they must hold wonders beyond what we can imagine in a 3 dimensional state of mind. If conciousness can exist on so low a level as 3 dimensions, then why not on higher levels?