Don't you dare! The admonishment that draws lines in sand challenges you to cross while barring it. Parents say it to kids reaching for forbidden items. Lovers say it jokingly, pushing borders. Enemies state it seriously, final warning before ramifications.
The phrase has an inherent contradiction: by saying don't you dare, you've planted the idea of daring, made the forbidden action then plausible. Under command, reverse psychology camouflaged as challenge wrapped in restriction.
Don't you dare leave me shows love that's become a hostage situation and despair. Don't you dare give up becomes motivation, strong love driving through opposition. Context converts danger into motivation.
Children hear it every day: don't you dare talk back, touch that, go there. Mapping the world by what's prohibited, every prohibition defines boundaries for proper behavior. Sometimes we defy nonetheless to see if outcomes match threats. Don't you dare: ultimatum that drives conflict, establishes boundaries, makes plain that certain acts have irreversible effects.