Theories of cat behavior

LAW OF CAT INERTIA
A cat at rest will tend to remain at rest, unless acted upon by some outside force, such as the opening of cat food, or a nearby scurrying mouse.

LAW OF CAT MOTION
A cat will move in a straight line, unless there is a really good reason to change direction.

FIRST LAW OF CAT ENERGY CONSERVATION
Cats know that energy can neither be created nor destroyed and will, therefore, use as little energy as possible.

LAW OF BAG/BOX OCCUPANCY
All bags and boxes in a given room must contain a cat within the earliest possible nanosecond.

LAW OF FURNITURE REPLACEMENT
A cat's desire to scratch furniture is directly proportional to the cost of the furniture.

LAW OF CAT COMPOSITION
A cat is composed of Matter + Anti-matter + It Doesn't Matter.

LAW OF CAT OBEDIENCE
As yet undiscovered.