The second most likely situation for a lockout is if you ever decide it won’t hurt to get the milk/shut the gate/pull the bin back from the street/rescue a bird from the cat/… in your dressing gown. Murphy’s Law clearly states that that is when the sudden gust of wind will come from nowhere and blow the door shut with you only half-decent and half-way down the garden path.

Incidentally, some say that it should have been named Sod’s Law. Actually it was Finagle’s Law, which only goes to show that (s)he was right.

And the most likely situation where you will lock yourself out? Moving day. As if the stresses of a move weren’t already enough, unfamiliarity with locking mechanisms and the new location of the hall table mean that a lot of people lock themselves out whilst moving in. Keep all your keys in your pockets at all times for the first ten days of living in a new place.