Never stand between a dog and the hydrant.
The squeaky wheel doesn't always get greased; it often gets replaced.
Soderquist's Paradox: There are more horses' asses than horses.
The information we need is not available. The information we want is not what we need. The information we have is not what we want.
The solution to a problem changes the nature of the problem.
The Rule of Accuracy: When working toward the solution of a problem, it always helps if you know the answer.