After writing, then discarding, a particularly snarky bit because it was too snarky for even me, I realized I am still due this week's entry.  Fortunately, to my rescue comes Blackboards in Porn!
"Celebrating pornographers who go the extra mile when set dressing classroom porn and actually write something on the blackboard. What do they write, and is it correct? (Humour site - Safe for work)".

Seriously.  And it's safe for work (which some might see as a deficit).  There are only 8 entries so far, each a serious evaluation of the accuracy of the equations and/or concepts used as set dressing for porn scenes set in a classroom.  For example, this look at a scene featuring a teacher, pupil, and a blackboard reading "2x + 3 = 9" and "x = /2 [or 12?]"

Mathematics - simple algebra.

The handwriting is large and generally clear, even though this class appears to only have one student in it, and he sits at the very front. It might be worth advising the student to have his eyes tested if he is unable to read smaller text at this distance. Remember that poor learning may be as a result of poor vision
It's amazing what you can tell about a teacher from their blackboard, even if the teacher is fake and the goal is porn.  I felt it was a learning experience.

Until next week,
Tuesdays at The Satellite Diaries and weekly at The Daytime Astronomer (twitter @skyday)