Just curious to look up "bang for the buck" idiom.
Story has it, that it originates from President Eisenhower's secretary of defense, who has a preference for putting the defense budget on nuclear arms. Building a nuclear arsenal are cheaper than spending money on conventional military arsenal; thus, more "bang for the buck".
Hopefully, the great people's leader of North Korea would hold off his "bang for the buck" toys. If he starts his "bang for the buck" next week, my worry for my D-Day would be a relative non-sense, LOL. Just imagine a bright flash of light out side while you are taking the exam !