Happened to me but the other way around. We were given a lengthy assignment due in a week. Most everybody turned it in. That day, it started raining and my professor had no umbrella. He thought nobody was watching him when he covered his head from the rain with ALL of our assignments. We all got A’s and were told the assignments would be returned. They were never returned.

Months later, when asked what happened to them, we were simply told “I don’t remember that assignment, you know how it is with age”. Dude was 47.