It's one of those artifacts of the electronic age: Videotape of an ordinary afternoon that, in a matter of seconds, became etched forever in our memories.
But what many of us have forgotten - or maybe never really knew - is what a close-call it really was.
Retired Secret Service agent Jerry Parr said we nearly lost the president that day. "Absolutely. I mean, there was absolutely no doubt in my mind that it was close."
Parr knows these pictures from the inside - it was he pushing Ronald Reagan into the limousine.
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