These items can fall if not firmly attached to wall or ceiling. We suggest that you check to make sure they are secured. If in doubt, take them down. Small cracks or crows feet will sometimes appear in older plaster or in cases were the attic space between the sheetrock and plywood is very minimal. These cases are often caused by the vibrations of the hammer and are often unavoidable. We cannot assume responsibility for these damages, as there is no way of controlling or keeping these things from happening. This will more than likely occur in vaulted ceilings.