Getting to the point...

"Robert Dallek writes in Flawed Giant: Lyndon Johnson and His Times, 1961-1973 of an unforgettable off-the-record encounter between President Johnson and skeptical reporters pressing him to explain why the United States was still fighting in Vietnam. Frustraed that his political reasoning was not convincing his listeners, the president unzipped his pants, pulled out his penis, and said, "This is why!""

- David Friedman in A Mind of It's Own pg 9.