Two weeks ago, a small, single-engine plane inadvertently strayed into the closed air space above Washington. The result was panic. Both the White House and the Capitol were evacuated, with police shouting “Run! Run!” at fleeing staffers and visitors. Senators and Congressmen abandoned in haste the floors of their respective Houses. Various RIPs (Really Important People) were escorted to their Fuehrerbunkers. F-16s came close to shooting the Cessna down.