Pushing my glasses up while teaching

In fall 1990, in my third year of graduate school at the University of Pennsylvania, I taught a first-year writing course for the first time. Two stories have stuck with me from that class; here's one. A couple days before the first session, a friend said that when I pushed up my glasses if they slid down my nose a bit, I should use my index finger and not my middle finger. I thought that would ruin my class, because I would worry about my glasses and fingers too much, but in fact, I ended up worrying enough about them that I did not worry about the contents of the class! (Andrew Shields, #111words, 1 December 2022)