I've learned a few of these over time by trial and error, mostly error.
After your hands become coated with grease, your nose will begin to itch.
--Lorenz's Law of Mechanical Repair
Identical parts aren't.
Any tool, when dropped, will roll to the least accessible corner.
--Anthony's Law of the Workshop
Nothing is as inevitable as a mistake whose time has come.
-- Tussman's Law
If it jams, force it. If it breaks, it needed replacing anyway.
The solution to a problem changes the problem.
There is no mechanical problem so difficult that it cannot be solved by brute strength and ignorance.
Machines should work.. People should think.
--IBM's Pollyanna Principle
The most ineffective workers shall be moved systematically to the place where they can do the least damage.
--The Dilbert Principle
The first rule of intelligent tinkering is to save all the parts.
It is a mistake to allow any mechanical object to realize that you are in a hurry.
If you tell the boss you were late for work because you had a flat tire, the next morning you will have a flat tire.
-- Cannon's Comment
The newer the carpet the greater the likelihood that the bread will land jelly side down.
-- Law of inevitable consequences