People Are Sharing Their Dumbest Students Stories, And It’s Amazing Any Of These People Graduated
At Least He Grasped The Concept, I Guess

Photo Credit: @BakerStJournal/Twitter/perceptionactionprof/Reddit
It was probably a joke, but he confused a fictional character with a real psychologist. He probably thought Sherlock was real too.
He’s not entirely stupid, but maybe he thought the author just used a real person as a character in the book. This ordeal happens often.