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Affirming the Consequent

The Fallacy

Thinking that just because you know the end of a story, you know exactly how it started.

Why it's wrong

Just because something happened, doesn't mean it happened for the one specific reason you're thinking of. There could be lots of other reasons!

Example

If I eat too much candy, I get a tummy ache. I have a tummy ache right now, so I must have eaten too much candy!