Murphy’s law

Quite Simply: Murphy’s law (also known as Finagle’s law or Sod’s law) broadly states that things will go wrong in any given situation. It is most commonly phrased as “Anything that can go wrong will go wrong.”

Some trivia: The law was named after Major Edward A. Murphy, Jr., a development engineer working for a brief time on rocket sleigh experiments done by the United States Air Force in 1949.