Every year I am reminded of the kids who aren't in the freshman class and aren't graduating. I remember every single one of them. That is the worst of times for me to see the future snuffed out.
But for me it is when a student has died. I find the death of a young person the most difficult and painful of times. To explain it to other young people to see a bright future snuffed out is just awful. I am haunted by those deaths.