Going back to school in the fall means getting a fresh batch of textbooks, which are always better used than new because other students have had the chance to doodle snicker-worthy stuff in the book.
These secret acts of vandalism used to be the funniest pictures in textbooks (unless you had a book from the 50s or 60s which was full of outdated information), but nowadays LOL-worthy stuff is included on purpose.
Okay, that one was obviously a mistake they missed during editing, but this picture must have been included on purpose, right?
Maybe it's for "Geometric Racial Stereotypes: a journey in racist maths"? They're teaching some strange stuff in schools these days...
Reminds me of a dirty trick we pulled on a college classmate. He had written a class paper on land use for a forestry class. We got a hold of it and the typewriter he wrote it on and typed up a page, inserting it in the end of his work. The page said something to the effect to "cut down all the trees and make it into a parking lot." His professor was not amused, neither was he, but he got over it.
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