Ah yes, Japanese girls... very partial to them, I am!
But, to keep this thread somewhere on topic, the username
Boeing737 reminded me, for some reason of that Air Florida event at Washington some years back. Went into the river on take-off due excess icing.
Well, to put that in the context of this particular topic, there are some things that you try not to think about too much. You do the best you can to ensure that the aeroplane is properly prepared for the flight. Just as long as you've done that to the best of your ability, you've given yourself - and your pax - the best possible chance of reaching the intended destination. That's as much as you can do.
Not being fatalistic here, simply realistic.