Life bites back

It’s definitely alarming when the bathroom door knob comes away in your hand. Less so when the door isn’t closed, leaving you trapped.
    There on the floor was the fixing screw, which must have been quietly unscrewing itself for who knows how long.
    So what do you do about that?
    Make sure that every doorknob is fitted with the screw at the top, not underneath and out of sight?
    Send a minion round to check every doorknob in the mansion?
    Put a screwdriver in every room?
    That’s life all over; full of little surprises, some of them really quite nasty.