Why Not to Trust Statistics: Correlation Coefficient
An energy drink is 'highly correlated with performance' only because of two paid pro athletes far from the rest of the data.
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Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2016-07-13-why-not-to-trust-statistics--correlation-coefficient/ (CC BY-NC 4.0)Transcript
Correlation Coefficient: "Try our energy drink—it's highly correlated with performance!"
[Scatter plot: athletic performance vs. amount of drink consumed: a cluster of low/low dots plus a couple of "professional athletes we paid to guzzle the stuff" far up and right]