Look back in history: bad guys like Caligula and Hitler, mixed-up guys like Alexander the Great, good guys like President Lincoln, brilliant but vindictive scientists like Isaac Newton. On the modern scene: President Clinton hardly slept as they stayed up late studying policy arcana, while Trump skipped all that and instead manipulated public opinion by mastering the twitterverse. Is this behaviour mad – at least some of it? Depends on who you ask. What is madness? Who is mad and who is not? These are not simple questions. For one thing, some seemingly mad people can be effective in their own spheres of influence – at least for a while. Sometimes, madness seems to be a benefit. It can help people focus and push on when others would give up. Combined with charisma, it can add a sense of drama and excitement to any leadership role. Humans love a good