Well, there is a possibility that an old bridge collaspes while you cross it or are underneath it. What if you're at the foot of a hill and the parking brakes on a car gives out. Termites may cause your house to collaspe while you're sleeping in bed. As for those nasty guns displayed on the wall, what if it falls and breaks your toe? It's the gun maker's fault for not using lighter materials like "nerf" sponge for barrels or paper mache for stocks.