Once I had a student turn in a published journal article as that student's own semester's research paper. My TA gave the paper an F based on the scoring rubric/on failing to meet the assignment guidelines and then emailed me to make sure I was in agreement. I changed the grade to a 0 in the online gradebook, told the TA to send any questions from the student to me. Student quickly sent me an indignant and rather impolite email suggesting that I change the grade to a 50/100 in recognition of the student's hard work on the assignment & so that the student could earn a C and not have to retake the course. I think it was definitely the most absurdly vagrant academic dishonesty I've ever encountered. The kid literally re-typed the original source article, but left off the author list (left the author affiliations though, which is a bit of a red flag when none of those affiliations are our school), fucked up the stats & notations (didn't know how to do fancy symbols, formatting, etc.), and hand-drew made up figures that had nothing to do with the paper (one was a graph that explained "the friend zone", and no it was not related at all to either the assignment or the article). Met with the student and saw someone seem to go through the stages of grieving at an accelerated pace over the course of ~half an hour.