I promised a few more --
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:
The people whose seats are furthest from the aisle arrive last. (I have seen that one in action.)
Law of Logical Argument:
Anything is possible if you don't know what you are talking about.