
Murphy's Law, or the adage that anything that can go wrong, will go wrong, has become a well-known concept since its coinage in the middle of the 20th century. The law, attributed to American aerospace engineer Edward A. Murphy Jr., has been interpreted in various ways and applied to different situations, from missing keys to relationship troubles. While some find Murphy's Law pessimistic, others believe it encourages problem-solving and a neutral viewpoint. The law also highlights the human tendency to focus on negative events, and its popularity may be due to its resonance with people's experiences. Similar concepts, such as Sod's Law and Spode's Law, also explore the idea that misfortune is inevitable.
| Characteristics | Values |
|---|---|
| Name | Murphy's Law, Sod's Law, Spode's Law, Reilly's Law, Strauss' Law, and various others |
| Origin | Coined by American aerospace engineer Edward A. Murphy Jr. in 1948 or 1949 |
| Meaning | Anything that can go wrong will go wrong |
| Corollaries | If it can go wrong, it will go wrong at the worst possible time. If there is a possibility of several things going wrong, the one that will cause the most damage will be the one to go wrong. |
| Exception | Something will never go wrong when you want something to go wrong. |
| Variations | If there are two ways to do something, and one of those ways will result in disaster, he'll do it that way. If something can go wrong, it will, so stay alert. |
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What You'll Learn

Murphy's Law
The concept of Murphy's Law is not new, and similar statements have been made throughout history. For example, in 1877, Alfred Holt of the engineering society ADS made a similar statement, noting that "anything that can go wrong at sea generally does go wrong sooner or later." In 1908, British stage magician Nevil Maskelyne wrote, "It is an experience common to all men to find that, on any special occasion, such as the production of a magical effect for the first time in public, everything that can go wrong will go wrong."
The law gained wider public recognition in the late 1970s with the publication of Arthur Bloch's 1977 book, "Murphy's Law, and Other Reasons Why Things Go WRONG," which included variations and corollaries of the law. Similar "laws" include Sod's law, Finagle's law, Yhprum's law, and Spode's Law.
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Sod's Law
The concept of Sod's Law can be viewed as a combination of the law of truly large numbers and the psychological effect of the law of selection. The former suggests that we should expect things to go wrong occasionally, and the latter states that exceptional events where something went wrong are more memorable than mundane events where nothing exceptional happened. Sod's Law is also explained as a form of the natural human negativity bias, the survival trait of being extra alert to negative events. For example, a driver might experience traffic lights turning red when they are in a hurry, or email software might crash at the exact moment they attempt to send an important message.
The term Sod's Law is commonly used in the United Kingdom, while Murphy's Law is more popular in North America. The concept of Murphy's Law, which is often referred to as an idiom or epigram, is generally attributed to American aerospace engineer Edward A. Murphy Jr., although its exact origins are debated. It is believed to have originated from Murphy and his team following a mishap during rocket sled tests between 1948 and 1949, and it was popularized by testing project head John Stapp during a press conference.
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Spode's Law
According to Murphy's Law, problems left unresolved tend to grow and become more challenging to fix. It also suggests that valuable items are more likely to be damaged or lost, and that things we don't care about tend to last longer. Murphy's Law can be applied to various situations, including missing items, relationship issues, and project deadlines.
While Spode's Law specifically refers to cloud coverage during astronomical observations, it shares similarities with Murphy's Law in acknowledging that things can often go wrong or not as planned.
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Resistentialism
While Murphy's Law and Resistentialism both acknowledge the potential for things to go wrong, they approach this concept from different perspectives. Murphy's Law focuses on the likelihood of negative outcomes, while Resistentialism attributes malicious intent to inanimate objects.
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Finagle's Law
The concept is similar to Murphy's Law, which states that "anything that can go wrong, will go wrong", but Finagle's Law is considered stronger as it suggests that even things that cannot possibly go wrong will still go wrong. This idea is sometimes referred to as "Gone Horribly Right". Finagle's Law is often used in storytelling, particularly in comedy and drama, to create tension and raise the stakes by piling disaster upon disaster.
A variant of Finagle's Law favored by hackers is known as O'Toole's Corollary, which states that "the perversity of the Universe tends towards a maximum". This idea is also expressed as "the perfidy of inanimate objects", suggesting that inanimate objects are out to get us. This belief is known as Resistentialism.
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Frequently asked questions
Murphy's Law is an adage that states that "anything that can go wrong will go wrong". It is attributed to American aerospace engineer Edward A. Murphy Jr..
Sod's Law is a British cultural axiom that is similar to Murphy's Law. It states that "if something can go wrong, it will". Sod's Law is derived from the term "unlucky sod", which refers to someone who has had a bad or unlucky experience.
Some examples of Murphy's Law include:
- Losing something and finding it only after replacing it.
- Valuable items being damaged or ruined.
- The buttered cat theory, which states that a piece of buttered toast will always land butter-side down.
- Projects taking longer than expected, with the last 10% of a project taking 90% of the time.
Some variations of Murphy's Law include:
- Finagle's Law, which states that the misfortune will happen at the worst possible time.
- The Law of Truly Large Numbers, which says that we should expect things to go wrong occasionally.
- The Law of Selection, which states that exceptional events stand out in memory, while mundane events are forgotten.




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