Parent: "I want you to evaluate my 13-year-old son." Doctor: "Okay. He's suffering from a transient psychosis with an intermittent rage disorder, punctuated by episodic radical mood swings, but his prognosis is good for full recovery." Parent: "What does all that mean?" Doctor: "He's 13." Parent: "How can you say all that without even meeting him?" Doctor: "He's 13."