The mythical author of Murphy's Law:

If anything can go wrong, it will.

There's even a ''cottage industry'' around this ''law'' and other ''derivations'' - 
see, for instance, http://www.murphys-laws.com/ as one example.


One of my favorite corollaries is

If anything can't go wrong, it still will.

[AM] I am surprised by the above link: it does not mention Samuel Beckett's novel "Murphy" - I always took that as the origin of the "law". 

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[Category Glossary]