Murphy's Law

Murphy's law is an adage that states "Anything that can go wrong will go wrong" and is often extended to "Anything that can go wrong will go wrong, and at the worst possible time." The law was coined by American aerospace engineer Edward A. Murphy Jr. in the late 1940s, although its exact origins are debated. The law gained wider public knowledge in the late 1970s with the publication of Arthur Bloch's book "Murphy's Law, and Other Reasons Why Things Go Wrong." Similar "laws" include Sod's law, Finagle's law, and Yhprum's law. The concept of Murphy's law has its roots in U.S. Air Force studies performed in 1949 on the effects of rapid deceleration on pilots, and precursors to the modern version of the law have been known for centuries.learn more on wikipedia