The tantrum with which Secretary General Annan greeted the now famous question about the missing Mercedes Benz tells us a lot about the tensions that are building at the United Nations. The question was lodged at a press conference by one of the best reporters in the U.N. press room, James Bone of the London Times. Mr. Annan, normally a mild-mannered, suave operator, lashed out at Mr. Bone, calling him "cheeky" and "an overgrown schoolboy," and accused him of being "an embarrassment" to journalism - upon which the august editorial page of the Wall Street Journal promptly invited Mr. Bone...