Post Hoc Ergo Propter Hoc — The Trick You Don't See Coming

Also known as: Post Hoc Ergo Propter Hoc, After Therefore Because, False Cause (Temporal Variant)

🔥 Hook

"I wore my lucky socks and we won the game.

Sound familiar? This happens more than you think.

🧠 What's Actually Happening?

Post hoc ergo propter hoc ('after this, therefore because of this') is the specific fallacy of concluding that because one event preceded another, the first event caused the second. While temporal sequence is a necessary condition for causation, it is not sufficient. Many events that follow others are coincidental, caused by confounding factors, or part of a broader pattern unrelated to the preceding event.

Here's the sneaky part: Temporal proximity is the most basic and intuitive cue for causation. Our brains evolved to learn from sequences (touching fire leads to burning), making post hoc reasoning feel natural and reliable even when it is not.

📱 Real-Life Scroll

What you'd see online:

"I wore my lucky socks and we won the game. My socks caused us to win!" or more seriously: "Crime rates dropped after we installed security cameras on Main Street, proving the cameras reduced crime." (Ignoring seasonal trends, economic changes, and other interventions.)

Another one

A CEO introduces a new office meditation room, and the following quarter profits rise. She announces at the all-hands meeting: 'The meditation room is driving our financial performance.' She ignores that a major competitor went bankrupt the same quarter, sending their clients to her company.

What it looks like IRL:

Foundational to superstitions, alternative medicine testimonials, policy evaluation without proper controls, and sports rituals. It is one of the most common reasoning errors in everyday life.

🔍 How to Spot It

Ask for a plausible mechanism connecting the two events and whether alternative explanations have been ruled out. Point out that correlation and temporal sequence do not establish causation without controlled comparison.

Quick checklist:

• ✓ Is the argument actually proving what it claims?
• ✓ Could I explain this to a friend without it falling apart?
• ✓ If I remove the emotion/pressure, does it still make sense?

💬 What You Can Do

When someone hits you with this, try: "Interesting, but does that actually follow?" You don't need to win. You just need to not get fooled.

🎯 Your Challenge

Find one example of post hoc ergo propter hoc this week. Could be anywhere — a debate, a comment section, a news article, or even your own reasoning. Write it down. The moment you can name it, it loses its power.

Part of the TellDear Teen Book — criticalthinking.guide