Reminds me of a story I heard from a family I know.
"Uncle Joe" went to a large, prestigious university in the 1960s. I don't know the exact date, so I'll say he graduated in 1968. Joe was proud of his association with the university and was always an enthusiastic and supportive alumnus.
When the family went through his papers after he died, they found a diploma dated 15 years after his graduation date. They surmised he must have lost the original & gotten a duplicate. Then they discovered that he had not graduated in 1968 after all, and had been misrepresenting his graduation to family, friends & employers for over 40 years.
Joe had enrolled in Underwater Basketweaving 101. Halfway through the course, he decided he hated it and simply stopped attending classes. Naturally, he failed. It wasn't until his last semester, when he was preparing to graduate, that he discovered it was a required course. He signed up to take it in summer school, and was allowed to participate in commencement exercises, even though he wouldn't officially graduate for several months. The university was so large that there was no individual recognition of graduates and diplomas were mailed out later, so the family who attended never knew Joe wasn't getting one.
Joe stayed in the college town for several years after "graduation," so was able to hide from his family his need to take another course. He dropped out of the summer school class because he still hated UB 101, but finally got around to completing the course the following year. However, he never bothered to apply to graduate.
Much later, Joe finally decided that he needed to actually have that college degree (the family guessed it was because he was looking for work at the time and employers were asking for proof of education, something he'd never needed before). The family found extensive correspondence between Joe & the university that Joe had saved, which even included notes about the UB class failures. It took a bit of doing, but Joe finally graduated, fifteen years after he took his last college class.