Dot writes: yesterday morning I left the bag containing my student’s essay and my lunch on the train. Then when I was in the changing room for the TCD swimming pool at the end of the day I found I’d left my phone in my office, and I had to go back for it – ten minutes each way including the stairs to the fourth floor on leaden, post-exercise, pregnant legs. I remember feeling preoccupied and dreamy last time round, but not this stupid.
Ken and Dot's Allsorts 
Did you ever get the essay, not to mention your lunch, back? If not, I trust the student had another copy (of the essay), something which would not have been the case in the precomputer age of my student days! Presumably the lunch was replaceable.
I rang up about my lost bag as soon as I could, but it had left the train before the terminus, though not with me… Fortunately I had the essay in electronic form as well, and I bought a different lunch.