There are some good examples of interesting/fun spurious correlations here (Examples for teaching: Correlation does not mean causation). Many/most of these are "funny" examples that aren't likely to affect real life decision making. In contrast, this thread (Real examples of Correlation confused with Causation) has some interesting examples of real-life misinterpretation of spurious correlations.

I'm wondering if anyone has cool/interesting favorites along the lines of the second thread, for a related-but-different phenomenon: published experiments (i.e., not correlational data) whose results were later discovered to be confounded in an interesting/unexpected/memorable way.

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