Mark Twain is not alone in thinking the President insane.

Mark Twain is not alone in thinking the President insane. Tales of Roosevelt’s unpredictable behavior are legion , though there is usually an explanation. Once, for instance, he hailed a hansom cab in Pennsylvania Avenue, seized the horse, and mimed a knife attack upon it. On another occasion he startled the occupants of a trolley-car by making hideous faces at them from the Presidential carriage. It transpires that in the former case he was demonstrating the correct way to stab a wolf; in the latter he was merely returning the grimaces of some small boys, one of whom was [his son] the ubiquitous Quentin

E. Morris, The rise of Theodore Roosevelt (1979), xxii