Immutable Laws of the Universe (sorry, but I don't know the source !)

Law of Mechanical Repair:
After your hands become coated with grease, your nose will begin to itch, or you'll have to pee.

Law of Probability:
The probability of being watched is directly proportional to the stupidity of your act.

Law of the Telephone:
If you dial a wrong number, you never get a busy signal.

Variation Law:
If you change lines (or traffic lanes), the one you were in will start to move faster than the one you are in now (works every time).

Law of the Bath:
When the body is fully immersed in water, the telephone rings.

Law of Close Encounters:
The probability of meeting someone you know increases when you are with someone you don't want to be seen with.

Law of the Result:
When you try to prove to someone that a machine won't work, it will.

Law of Biomechanics:
The severity of the itch is inversely proportional to the reach.

Law of the Theatre:
At any event, the people whose seats are furthest from the aisle arrive last.

Murphy's Law of Lockers:
If there are only two people in a locker room, they will have adjacent lockers.

Law of Rugs or Carpets:
The chances of an open-faced jelly sandwich landing face down on a floor covering are directly correlated to the newness and cost of the carpet/rug.

Law of Logical Argument:
Anything is possible if you don't know what you are talking about.

Oliver's Law:
A closed mouth gathers no feet.

Wilson's Law:
As soon as you find a product that you really like, they will stop making it