I was a professor for 40 years.

One of my nightmares was walking into the commercial dungeon that I frequented for over 10 years and seeing, among the Dommes waiting between sessions in the common room, one of my students or former students.

This dungeon occupied the entire floor of a small building in Manhattan. Another nightmare was seeing, as I was leaving the elevator on that floor of the building in which the dungeon was located, the Dean of the College where I was employed waiting to enter the elevator. (There were five different deans over the years, but that didn't change the nightmare.)