I still very fondly remember the first time I was upgraded to C... on SN (the old, not the new). I was still a young, struggling graduate student then, living in a new country and I think some agent took pity upon me after having been rebooked 36x on return itinerary to the states after being home in Brussel for the summer holidays. It was at least 15 years and much more grey hairs before I arrived to the point where we fly C or equivalent nearly always, and I try to always remember how privileged our lives are now.