Murphy's Laws ...

FIRST: Nothing is as easy as it looks.

SECOND: Everything takes longer than you think.

THIRD: In any field of endeavor, anything that can go wrong will go wrong.

FOURTH: If there is a possibility that several things can go wrong,
then the one that will cause the greatest damage will be the one to go wrong.

FIFTH: If anything absolutely can NOT go wrong, it will anyway.
SIXTH: If you perceive that there are four possible ways in which a procedure
can go wrong and circumvent these, then a fifth way, unprepared for, will promptly develop.

SEVETH: Left to themselves, things tend to go from bad to worse.

EIGHTH: If everything seems to be going well, you have obviously overlooked something.

NINTH: Nature always sides with the hidden flaw.

TENTH: Mother Nature is a "son-of-a-gun."

ELEVENTH: It is impossible to make anything foolproof, because fools are so very ingenious.

TWELTH: Things get worse under pressure.