Years ago, a student caught my attention: she kept tilting her head during class and kept holding her head in her hand during exercises. It didn't seem particularly comfortable but; to each their own.
It wasn't until I started walking around to point out each student's blatant code errors (best moments during class) that I saw her screen.
Startled, she said:
"Yeah, uhm... used some shortcut and the screen rotated."
🤣
I explained 'Ctrl-Alt-left arrow' so all could rotate their screens. Fun times.