You are speaking of ascribing motives on insufficient evidence?

Isaac Asimov: It was interesting to hear your opinions of my work, Dr., but when I wrote that book I had nothing of the sort in mind.

English Professor: I'm pleased to meet you Dr. Asimov. I've always been a big fan of your work, but, tell me, just because you wrote it what makes you think you have any idea what it's about?