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Murphy's Law Bias

Also Known As: Sod's law bias Pessimism bias
Cognitive Bias ID: murphy_s_law_bias

Definition

The tendency to overestimate the likelihood that things will go wrong, based on the folk wisdom 'anything that can go wrong, will go wrong.' People selectively remember and attend to negative outcomes while underweighting the many times things went smoothly. This creates a pessimistic distortion of reality that feels validated by experience.

Examples

A commuter believes they always hit red lights when they're running late, but doesn't notice the many times they hit green lights when on time. The emotional salience of frustrating delays creates a biased sample in memory.

A software developer is convinced that production systems always crash during his on-call shifts, leading him to dread being on rotation. In reality, incidents are distributed fairly evenly among the team, but the stressful outages during his shifts are far more memorable than the uneventful ones.

A first-time homebuyer is certain that her offer will fall through because 'things never work out when it really matters.' She recalls several past disappointments vividly while discounting the many times important plans did succeed, reinforcing a skewed sense that bad outcomes are her personal norm.

Verification Steps
Verification Steps
Binary yes/no questions that an AI must answer to detect a reasoning pattern in a text.
Each of the 452 aspects has verification steps — simple yes/no questions designed to systematically detect whether a pattern appears in a text. For ad hominem: "Does the argument attack a person rather than their claim?" For false dichotomy: "Are only two options presented when more exist?" This ensures consistent, reproducible analysis.

Binary (yes/no) questions an LLM must answer to identify this aspect:

  1. 1

    Is a decision being judged by its result rather than the reasoning behind it?

    Type: binary
  2. 2

    Would a bad outcome from a sound decision process be used to condemn the decision?

    Type: binary
  3. 3

    Is a lucky outcome being used to validate a poorly reasoned decision?

    Type: binary
Deep Dive
The expandable detail section on each aspect page with examples, psychology, and counter-strategies.
The Deep Dive section provides in-depth information about each aspect: a real-world example showing the pattern in action, an explanation of why it works psychologically, practical advice on how to counter it, alternative names, and links to related aspects.

Hierarchical Context