Apologies if this question is considered off-topic on this forum.
Somewhere in the 1990s, I saw a comic (newspaper comic, but I don't remember which newspaper) about a mathematics teacher. His school had advertised that pupils on their school receive only A's; the teacher however had given one pupil an A-minus, for writing something like '5+5=11', upon which he is sued by the pupil. The comic then goes on to show how the school chooses side with the pupil, how the teacher ends up in court, being crushed by the pupil's advocate, by the press, etc.
Does anyone remember this comic?