 When the movie director Alfred Hitchcock mused ‘All actors are children’ he was taking liberties with clear negative cases of ‘child’ rather than its borderline cases. The aptness of his generalization is not judged by its literal truth-value (because it is obviously untrue). Likewise, we do not judge precisifications of borderline cases by their truth-values (because they are obviously not ascertainable as true or false). We instead judge precisifications by their simplicity, conservativeness, and fruitfulness. A precisification that draws the line across the borderline cases conserves more paradigm usage than one that draws the line across clear cases. But conservatism is just one desideratum among many. Sometimes the best balance is achieved at the cost of turning former positive cases into negative cases.