Murphy's First Law :
Nothing is as easy as it looks.

Murphy's Second Law :
Everything takes longer than you think.

Murphy's Third Law :
Whatever can go wrong, will go wrong.

Murphy's Fourth 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.

Murphy's Fifth Law :
If anything just cannot go wrong, it will anyway.

Murphy's Sixth Law :
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.

Murphy's Seventh Law :
Left to themselves, things tend to go from bad to worse. After things have gone from bad to worse, the cycle will repeat itself.

O'Toole's Commentary on Murphy's Law :
Murphy was an optimist.

Nixon's Theorem :
The man who can smile when things go wrong is the man who has thought of someone he can blame it on.

Osborn's Law :
Variables won't, constants aren't.

Peer's Law :
The solution to a problem changes the problem.

Robert E Lee's Truce :
Good judgement comes from experience; experience comes from bad judgement.

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Misc collections :

Blessed is the end user who expects nothing, for he/she will not be disappointed.

Build a system that even a fool can use, and only a fool will want to use it.

The first myth of management is that it exists.