What was murphy's law?

I believe it was, " Anything that can go wrong, will go wrong." But I'm not quite sure.

The original Murphy's Law was "If there are two or more ways to do something, and one of those ways can result in a catastrophe, then someone will do it." The law's author was Edward A. Murphy, Jr., a U. S. Air Force engineer, who, in 1947, was involved in a rocket-sled experiment in which all 16 accelerator instruments were installed in the wrong way, resulting in Murphy's observation. Murphy's Law is sometimes expressed as "Anything that can go wrong, will - - at the worst possible moment." In that format, the Law was popularized by science-fiction writer Larry Niven as "Finagle's Law of Dynamic Negatives " (sometimes known as "Finagle's corollary to Murphy's Law").