Jenny's teacher (Preludes and Distractions)
From Jenny Everywhere Wiki
In one universe, a this individual, a teacher, graded an exam taken by Jenny Everywhere. The teacher gave her a B, due to the fact that, although all of Jenny's other answers were correct, there were no Mind Flayers in the novel The Three Musketeers as Jenny had claimed due to her memories of another universe, nor had the teacher ever heard of the creatures. (PROSE: Preludes and Distractions)