I was cycling down King's Parade on my way to an early evening seminar, when I was flagged down by a fellow student whom I had never really liked. Once I had been convinced that the devastating news was true, my own private version of "shooting the messenger" meant that I could never bear to be in that particular student's company thereafter.
Vice-President Lyndon Johnson was sworn in aboard the presidential jet, Air Force One, two hours after Kennedy had been declared dead.
In the all-too familiar photograph of him taking the oath (on JFK's own Catholic missal, because no Bible could be found), Jackie Kennedy stands close at his side still wearing the suit stained with her husband's blood, where she had cradled his head in her lap as the motorcade rushed to hospital.
When Donald Trump was elected, he may not have realized all the tough choices he would have to make as president. Often described as the "Little Paris of Middle Europe," Budapest is famous for its own 1,000-year-old culture and also the culture of others who settled here.
Remains from both Roman and Turkish occupations can still be seen in the city.
But this was the period during which I came to believe that if you felt passionately that there were things that needed putting to rights in the world you lived in, then you had to be prepared to take direct action to effect necessary political change.
Lyndon Johnson, or "LBJ" as we always referred to him, loomed large among the things that I was convinced needed changing.
Lyndon Baines Johnson was a man of many contradictions.
Personally rude, overbearing and at times politically unscrupulous, he was nevertheless capable of immense personal charm, particularly when he was lobbying and brokering backstage in the Washington corridors of power.
Democrat and Republican Senators pushed through the Russian sanctions bill with an overwhelming majority on Thursday after the president's new communications director suggested that he might not sign it into law.
The bill - which also applies to North Korea and Iran - targets slave labor and corruption in the three countries.
It was passed with a vote of 98-2 and was earlier approved by the House with a vote of 419-3, two solid enough majorities for Congress to override the president should he veto it, a scenario which was suddenly tossed up by Anthony Scaramucci earlier in the day.
The Senate passed a new Russia sanctions bill on Thursday after it was suggested by senior White House staff that the president may not sign it.
In 1965, I remember particularly vividly a student march to Downing Street led on our behalf by the distinguished academic and activist Raymond Williams, to hand in to the then-Prime Minister Harold Wilson a petition against British involvement in the increased bombing.