The language of parental power plays

Saying “Sand is not for throwing” is a euphemism for “I have made the rule that you may not throw sand, and I am going to enforce it.” This euphemistic construction is ubiquitous: “Food is not for throwing” (“I have made the rule that you may not throw food, and I am going to enforce it.”); “Hitting is not appropriate,” (“I have made the rule that you may not hit, and I am going to enforce it.”).