Once in 10th grade English, I accidentally left my assignment at home and because I had a record as such a perfect student, the whole class was shocked. My teacher felt so bad she gave me credit anyway. By the end of high school I didn't have to do any HW if I didn't want to tbh, my teachers never even bothered checking
Oh and just the other day I accidentally sent an email to my sociology professor saying "my paper is attached" but I accidentally forgot to attach it

She was nice and didn't take off any points though when I finally noticed my mistake and sent it to her the next morning.