Back in 6th grade, there was some rule that if you had at least 2 missing assignments, you couldn't go to lunch for 20 minutes out of the 25 minute lunch period for an entire week. What you pretty much did was work on the assignments. I'm a good student, but one week, something dun goofed. They were two in-school cello lessons what weren't in the gradebook yet, since our orchestra teacher was out due to a family emergency. So the teacher who ran all of this took this as two actual assignments for core classes, I had to go to ZAP for an entire week and starve for an extra 20 minutes for a teacher mistake. This happened quite frequently, so I heard that a bunch of parents complaining, and the teacher's only response was their "Zeros aren't permitted policy" and other bullstuff excuses.
When my orchestra teacher came back and heard about the mistake, she gave me some candy.
TL;DR My school had some bullstuff program to keep the white lazy trash from going to lunch and a number of good students accidentally got themselves mixed in.