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logical detective

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  • The Magical Thinking Report I woke up feeling tired today because I went to bed early. Every time I sleep early, I feel tired. Therefore, going to bed early makes you more tired.
    Fallacy: False causation Why: Feeling tired isn’t necessarily caused by sleeping early. Corrected: “I felt tired today; it could be due to many factors.”
  • The Misleading Survey Most of my friends use social media for five hours a day, so it’s safe to assume that everyone in the country spends at least five hours online daily.
    Fallacy: Sampling bias / Overgeneralization Why: A friend group does not represent the entire country. Corrected: “My friends use social media a lot, but nation
  • . The Confused Cause and Effect The park gets crowded in the afternoons because the birds are loud. People must hear the birds and decide to go there.
    Fallacy: False causation Why: Crowds gather for many reasons, not because of birds. Corrected: “The park is crowded because people choose to visit afternoons.”
  • The Fast Fix Fallacy We should stop reading long reports because they take too much time. If we avoid long documents completely, everyone will work faster and productivity will double.
    Fallacy: Oversimplification Why: Avoiding long reports won’t magically double productivity. Corrected: “We could summarize long reports to improve efficiency.”
  • The Perfect Student Illusion Maria always submits her assignments early, so she must understand every topic perfectly. In fact, if she ever asks a question, it means she’s pretending not to know.
    Fallacy: False assumption / Circular reasoning Why: Submitting early ≠ perfect understanding; questions don’t imply pretending. Corrected: “Maria submits early,
  • The Fast Food Paradox The new burger place is excellent because everyone says it’s excellent. If so many people say it’s great, it must be great. Otherwise people wouldn’t say it’s great.
    The Fast Food Paradox Fallacy: Circular reasoning Why: “It’s great because people say so” uses the claim to prove itself. Corrected: “Many people say it’s great
  • The Mysterious Weather Theory It rained on my birthday last year and this year, which means it will rain on my birthday every year from now on. Weather is obviously predictable if you look closely.
    Fallacy: Faulty prediction / Hasty generalization Why: Two rainy birthdays don’t determine lifelong weather patterns. Corrected: “The rain on my birthdays is a
  • The Homework Heist Tom didn’t submit his homework today. He must be failing the entire course. And if he’s failing the course, he is probably failing every subject this semester.
    The Homework Heist Fallacy: Slippery slope Why: Missing one assignment ≠ failing every class. Corrected: “Tom didn’t submit homework today; he may need help or
  • The Broken Statistics Case Our office coffee machine broke twice this month, which clearly proves that machines are becoming less reliable every year. We should probably replace all electronics immediately before they fail too.
    Fallacy: Overgeneralization / Faulty causation Why: Two incidents don’t prove “electronics everywhere are failing.” Corrected: “The coffee machine broke twice,
  • The Incredible Coincidence Law Every time I wear my blue jacket, I get good news. So if I want success, I just need to wear the jacket more often. It clearly influences events.
    Fallacy: Post hoc (false cause) Why: Wearing a jacket doesn’t influence outcomes. Corrected: “The good news is coincidence, not caused by the jacket.”
  • The “One Example = Universal Rule” Argument I met one rude cyclist on the road yesterday, so cyclists are generally arrogant. They shouldn’t even be allowed on the road because they all behave the same.
    The “One Example = Universal Rule” Argument Fallacy: Overgeneralization / Stereotyping Why: One rude cyclist doesn’t represent all cyclists. Corrected: “I met a
  • The “Expert by Experience” Claim I’ve traveled abroad once, so I can confidently say that all countries are basically the same—same people, same food, same culture. Anyone who disagrees hasn’t traveled correctly.
    Fallacy: Oversimplification / False generalization Why: One trip cannot define all countries. Corrected: “I’ve traveled abroad once, but countries differ greatl
  • The Job Performance Puzzle Our new intern is always quiet during meetings. Quiet people never have leadership potential, so he should not be given important tasks.
    Fallacy: Stereotyping / Unsupported inference Why: Being quiet doesn’t mean lacking leadership skills. Corrected: “He is quiet in meetings, but that doesn’t ref
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