The infamous "Daisy" TV ad that Johnson ran against Goldwater in the 1964 US presidential campaign. It was shown only once, but that was enough to inflict significant damage on Goldwater.
I'd say this was an enormous piece of irony, because it's intent was to portray Goldwater as this unbalanced lunatic intent on dragging the US into war. In reality, LBJ was one of the most unbalanced and mentality skewed presidents we've ever had, and his lying about the Gulf of Tonkin DID drag us into the war. Along with McNamara, he continued to lie about the war, including fighting in Cambodia, US war causalties and our general progress.
History has shown that the man with true principles and ethics was Goldwater, not LBJ.