KID: So will you have mercy on the people who were out sick last week?
ME: Well...I will for the people who emailed me and said they weren't going to be here.
KID: (hesitating, looks embarrassed): I didn't know your name.
(I reminded her that, like many things, "it's on the syllabus." I also pointed out to the class that, even though my last name might be hard to remember, we'd have a completely different problem if I were Professor Jones, since they'd have to figure out which of the 29 Professor Joneses I was).