we had a very old picture on our wall in our last house, and it had been up for years, however one night in the early hours of the morning we were wakened by a thud downstairs, when we went downstairs to investigate the picture complete with hanging nails glass frame and hanging wires had jumped from the wall to the the setee then landed on the floor face upwards. one would had thought had the picture fallen onto the setee it would have stayed there instead of landing onto it then onto the floor.