Mine has to be a tie between the thing where the person thinks contrapositives have to coexist and the composition fallacy. The second one especially because economics taught me it and I love that class.
Ben and Jen are friends who enjoy sneaking into movies. reports of people breaking into movies committing arson exist. Therefor, Ben and Jen will commit arson.
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All men are mortal.
Socrates is mortal.
Therefore, all men are Socrates.
Ben and Jen are friends who enjoy sneaking into movies.
reports of people breaking into movies committing arson exist.
Therefor, Ben and Jen will commit arson.
I feel this is good because it's butter.
Now I can't believe it's butter.
I no longer feel good.