11th grade physics class at Poly. The instructor was interrupted by the intercom/telephone. He answered, didn't say anything and hung up. Then he carried a chair to where the American flag hung from the wall, removed the flag, rolled it up, stepped down from the chair and said to a silent and bewildered class: "the President has been killed."
I don't remember anything about the rest of the class. During passing there were a lot of crying students. My next class was lunch. I drifted over to the Park Library on Page Street and listened to radio reports before returning to school.