This paper develops a comprehensive optimality-theoretic analysis of a Japanese reversing argot. Similar to other types of prosodic-morphological word formation, the argot shows the activation of constraints defining phonological unmarkedness. This manifests itself in the emergence of optimal prosodic form, within the limits imposed by a game-specific reversal requirement. The latter is formally characterized as Cross-Anchoring, a playful variation of the normal correspondence-theoretic anchoring constraints that are part of the phonological grammar. Under the combined pressure of Cross-Anchoring and high-ranking prosodic form constraints, the argot distorts each ordinary-language base word in the minimal way, otherwise echoing it as faithf...