Whitehead's Law: The obvious answer is always overlooked.
William's Law: There is no mechanical problem so difficult that it cannot be solved by brute strength and ignorance.
Wood's Axiom: As soon as a still-to-be-finished computer task becomes a life-or-death situation, the power fails.
Woodward's Law: A theory is better than its explanation.
Zall's Laws: First Law - Anytime you get a mouthful of hot soup, the next thing you do will be wrong. Second Law - How long a minute is, depends on which side of the bathroom door you're on.
Zymurgy's First Law Of Evolving System Dynamics Once you open a can of worms, the only way to recan them is to use a larger can.