Obvious violations of rule one and three, and possibly two.
1. Always point the muzzle in a safe direction; never point a firearm at anyone or anything you don't want to shoot.
2. Keep your finger off the trigger and outside the trigger guard until you are ready to shoot.
3. Keep the action open and the gun unloaded until you are ready to use it.
And any firearm supposed to be used for blanks should be marked as such, and made incapable of firing real ammunition...it's not rocket science...any gunsmith can manage it.
Of course, I once owned a French military rifle. It had never been fired, and only dropped once!