Flying Clock - Poltergeist Activity

I suddenly remembered a couple of spooky things (circa 1988) that happened at 21 Kings Drive when I was a teenager.

One evening me, my mum and two sisters were sitting in the lounge watching TV when we heard a loud thud from my mum's bedroom directly above us. We all crept up the stairs feeling quite frightened. Upon entering the bedroom we found a large picture (which featured a real working clock) lying on my mum's bed. The picture had literally flown off the wall, approximately 5 feet in order to achieve this. Between the wall and the bed was a desk covered with tubs of pens, staples and paper clips etc -- none of which had been disturbed.