I plagiarized a book when I was Kindergarten.
I re-drew the illustrations, inserted my own version of the narrative, and assembled the pages for my teacher to review. I was proud. I didn’t have any concept that this was wrong – and at the age of 5, why would I have had any such concept? No one expects a Kindergarten student to be able to compose a short story, let alone understand integrity in authorship as well as copyright issues.