In high school I had a chemistry teacher who offererd that the grade submitted at the end of the year would be the greater of your grade with and without homewo

In high school I had a chemistry teacher who offererd that the grade submitted at the end of the year would be the greater of your grade with and without homework. He also warned that only occasionally the latter is a benefit rather than a harm. This intrigued me so much that I did the homework and didn't submit it in order to get a bad homework grade and overall top marks in the class. Anonymous grade info was posted on the wall periodically, everyone wanted to know who had the zero in homework.