Anything that can go wrong will go wrong.

# 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
# If 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

# The Murphy Philosophy
Smile . . . tomorrow will be worse.

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mais aqui