Oh my.
I was in high school. That was the day that to me, defined my generation and pushed many of us from the "Happy Days" of the 1950's, to the distrustfulness and turmoil of the 1960's.
I was first told of the assassination attempt by a boy in home room, and we all laughed and thought he was joking. Another boy said he thought it was great (since he did not care for Kennedy's politics).
Then news of the shooting came on the loudspeakers so we knew it was not just a joke. We were allowed to either stay in class and study, or go to the school auditorium and watch the coverage on a (relatively) big screen TV there. I did the latter for a while, and I will never forget Walter Cronkite's announcement that the President was dead.
After a while, that was too much for me and I went back to English class (which was now a study hall). My English teacher had been weeping and I had never seen anything affect her like that. The Principal did a brief, gut-wrenching extemporaneous eulogy over the public address system.
Interestingly, the boy who first told us of the shooting (when we thought it was a joke), grew up to be a member of the U.S. House of Representatives. I do not wish to reveal which one. Apparently the events of that day did not deter him from pursuing a political career.