Murphy's Law, often rendered as "If anything can go wrong, it will." was named after Captain Edward A. Murphy, an engineer. It seems rather negative but in fact it's a central tenet of "defensive design" a design methodology in which engineers attempt to make idiot-proof systems. Murphy's Law inspires a whole host of related laws, principles, corollaries, theories and clever sayings. Here, along with Murphy's formulation, are seven other classic Murphisms.

• If anything can go wrong, it will. (Murphy's Law)
• 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.
• Nature always sides with the hidden flaw.
• Whatever has happened wrong, is bound to happen again .... maybe even worse.

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