Episode Five, "The Flood"
The news of Martin Luther King Jr.'s assassination affected every character, young and old, black and white, in "The Flood." But it was Joan's misguided attempt at solidarity with Don's African-American secretary, Dawn Chambers, that brought the sole moment of levity to what was a very somber episode. When Dawn arrives at the office the day after the news broke, Joan doesn't hesitate to throw her arms around her colleague. Dawn's confused reaction and lack of reciprocation encapsulated the confusion felt by all Americans during that time, and Joan's "We're all so sorry" put a nice comic button on the scene, as if Dawn knew Dr. King personally because of her skin color. It was such a WTF? moment that it quickly went viral – in the form of a GIF file.