In this chapter I seek to rehabilitate and elaborate the so-called “mischief rule” of English law. I begin by interrogating two views of legal and constitutional interpretation which make symmetrical mistakes about legal interpretation: Larry Alexander and Emily Sherwin’s view in Demystifying Legal Reasoning and Jack Balkin’s in Living Originalism. Against these views I argue that the appropriate interpretation of laws is guided by the “mischief” the legislators were trying to remedy when they created the law and by what the (...) legislators and the subjects of the law understand when laws are created or changed. (shrink)