Murphy's law
Murphy's Universal Law....(all other laws are derivations/variations/extensioExtended Murphy's Law: If a series of events can go wrong, it will do so in the worst possible sequence.
Grossman's Misquote of H. L. Mencken: Complex problems have simple, easy-to-understand wrong answers.
Imbesi's Law of the Conservation of Filth: In order for something to become clean, something else must become dirty.
Maryann's Law: You can always find what you are not looking for.
Cafeteria Law: The item you had your eye on the minute you walked in will be taken by the person in front of you.
Etorre's Observation: The other line moves faster.
O'Brein's Variation on Etorre's Observation: If you change lines, the one you just left will start to move faster than the one you are now in.
Kenton's Corollary: Switching back screws up both lines and makes everybody angry.
Hutchison's Law: If a situation requires undivided attention, it will occur simultaneously with a compelling distraction.
Jones' Law of Zoos and Museums: The most interesting specimen will not be labeled.
Wallace Wood's Rule of Drawing:
1)Never draw what you can copy.
2)Never copy what you can trace.
3)Never trace what you can cut out and paste.
Roger's Law: As soon as the stewardess serves the coffee, the airliner encounters turbulence.
Davis' Explanation of Roger's Law: Serving coffee on aircraft causes turbulence.
WILLOUGHBY'S LAW
When you try to prove to someone that a machine won't work, it will.
Courtesy: A forward apparent from Sannidhi :)