>>6 Believing in the supernatural isn't an excuse to blame common occurances on it.
Com'on. I'm as spiritual as the next medium, but that doesn't mean everything that happens is supernatural. This kind of thing is not unusual and is easily explained without any talk of spirits.
Just because you believe in ghosts doesn't mean you should assume a door slamming is the work of an evil spirit... when the windows are open in that room and a room across the hall. It's common for doors to slam from the combination the second there is a chance in the airflow between them. Just like that, the explanation of this experience is fairly well-known to not be supernatural.
I suppose there could be a spiritual combination in some instances, but that doesn't mean that the situation itself would be blatantly unnatural.