If you're over 40 or even the least bit interested in the side show that is American politics, you have either seen or heard of the following political commercial that only ran once:
I was reading the Society of American Archivists listserv today and one of the subscribers posted the CONELRAD ("All Things Atomic: The Golden Age of Homeland Security!") website that has methodically chronicled the history of the political commercial known as "Daisy" but officially named "Peace, Little Girl."
September 7th was the 43rd Anniversary of the airing of the "Daisy" commercial, and it is quite possibly the reason why Lyndon Johnson beat Barry Goldwater in 1964. CONELRAD chronicles the making of the political ad with documents, biographies of the admen and others, quotes from those involved, and as an added bonus, there's an interview with "Daisy" herself.
CONELRAD is the acronym (CONtrol of Electronic RADiation) given to the first radio Emergency Broadcast System, which could, at one time, be found between your 640 and 1240 AM frequencies.
By the way, this commercial aired at about the time I first came home from the orphanage. I wonder if my mother watched it with her new baby in her arms? If so, it must have been frightening.