Question 1
EasyA city installed new park lights in May. Bike theft reports dropped in June, so a council member says the lights caused the decline.
Free logical fallacy tool
Free Post Hoc Fallacy Examples Guide
A post hoc fallacy happens when someone assumes one event caused another just because it happened first. This interactive guide gives you post hoc ergo propter hoc examples, evidence checks, and practice questions for separating sequence from causation.
Use these false cause fallacy examples to test causal claims in politics, media, workplaces, schools, and everyday health advice.
9 worked examples5-question quizMechanism checks
Want to watch causal claims collide in live arguments? Visit the main AI Bot Debate arena.
Interactive post hoc fallacy examples
Browse before-and-after claims and test the causal leap
Filter by context, search for a topic, and open any card to compare the event sequence with the causal claim. Each example includes missing evidence, a better question, and a fair response.
How to use this post hoc fallacy examples guide
The fastest way to test a post hoc argument is to slow down the timeline and ask what else could explain the later result.
- 1
Write the sequence
Separate the event that happened first from the outcome that happened later.
- 2
Name the causal claim
State exactly what the speaker says caused what, without adding extra assumptions.
- 3
List other explanations
Look for trends, comparison groups, natural recovery, outside events, or measurement changes.
- 4
Ask for mechanism
Request evidence that explains how the first event produced the later outcome.
Post hoc fallacy quiz
Test whether the causal claim is supported
Choose the best diagnosis for each scenario, then submit to see where sequence alone is too weak.
Question 2
MediumTwo similar classrooms tried different reading routines. Only the class using the new routine improved after eight weeks.
Question 3
EasyA person drank a special tea after getting a headache. The headache faded an hour later, so they say the tea cured it.
Question 4
HardA campaign says unemployment fell after a speech, so the speech caused the improvement.
Question 5
HardA server outage started three minutes after a deployment. Logs show the deployment changed the database connection string and every failing request used the bad value.
Frequently asked questions
What is the post hoc fallacy?
The post hoc fallacy happens when someone assumes that because one event happened before another, the first event caused the second.
What does post hoc ergo propter hoc mean?
Post hoc ergo propter hoc means after this, therefore because of this. It names the mistake of treating sequence as proof of causation.
What is a simple post hoc fallacy example?
A simple example is saying a lucky shirt caused a team to win because the win happened after wearing it. The timing alone does not prove the shirt caused the result.
How do you respond to a post hoc argument?
Ask for a causal mechanism, compare similar cases where the first event did not happen, and check whether other explanations fit the same timeline.
Is every before-and-after claim a post hoc fallacy?
No. Before-and-after evidence can be useful when paired with comparison data, mechanism evidence, and controls for alternative explanations.
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