Ahahah, an old one, but there’s a story behind it.
My biology exams in high school are notorious for being really, really long. It was entirely possible to do the exam twice, check over your answers thrice, do some drawings, and still have time left.
Me, being who I am, drew a movie poster-esque thing for one of my stories on the back of one of the exam booklets. (Just so you know, it was pretty common practice to draw on any exam booklet printed by the school.)
The line art’s a bit faded now since I did this…in year 11, I think.
Maybe one day I’ll remake it.