Murphy's law is an adage or epigram that is typically stated as: "Anything that can go wrong will go wrong." In some formulations, it is extended to "Anything that can go wrong will go wrong, and at the worst possible time."
British mathematician Augustus De Morgan (pictured circa 1860) wrote in 1866 that "whatever can happen will happen".
British stage magician Nevil Maskelyne wrote in 1908 that, during special occasions, "everything that can go wrong will go wrong".
John Stapp riding a rocket sled at Muroc Army Air Field (pictured circa the late 1940s or early 1950s). Murphy's law most likely originated during similar tests in 1948 and 1949.
A rocket sled is a test platform that slides along a track, propelled by rockets.
Lt. Col. John P. Stapp rides the rocket sled at Edwards Air Force Base
Sonic Wind No 1. This rocket sled was ridden by John Paul Stapp in the 1950s.
The vehicle that achieved Mach 8.5
The Holloman Air Force Base track