Just laws
If anything can go wrong, it will
 If there is a possibility of several things going wrong, the one that will cause the most damage will be the one to go wrong
If anything just cannot go wrong, it will anyway 
f you perceive that there are four possible ways in which something can go wrong, and circumvent these, then a fifth way, unprepared for, will promptly develop 
Left to themselves, things tend to go from bad to worse 
If everything seems to be going well, you have obviously overlooked something 
Nature always sides with the hidden flaw 
Mother nature is a bitch. 
Things get worse under pressure. 
Smile . . . tomorrow will be worse. 
Enough research will tend to support whatever theory. 
It is impossible to make anything foolproof because fools are so ingenious. 

image Back and smile