Law of Mechanical Repair - After your hands become coated with grease, your nose will begin to itch and you'll have to pee.
Law of Gravity - Any tool, when dropped, will roll to the least accessible corner.
Law of Probability - The probability of being watched is directly proportional to the stupidity of your act.
Law of Random Numbers - If you dial a wrong number, you never get a busy signal and someone always answers.
Law of the Alibi - If you tell the boss you were late for work because you had a flat tire, the very next morning you will have a flat tire.
Variation Law - If you change traffic lanes, the one you were in will always 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 dramatically 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.
Thanks to Doug.