Goodhart’s law: “Any observed statistical regularity will tend to collapse once pressure is placed upon it for control purposes.” And Marilyn Strathern’s gener

Goodhart’s law: “Any observed statistical regularity will tend to collapse once pressure is placed upon it for control purposes.” And Marilyn Strathern’s generalization of it: “When a measure becomes a target, it ceases to be a good measure.” What are some examples of Goodhart’s Law that you see in the world?