My physics teacher attempted some reverse psychology on me and banned me from doing homework. After a while, I think when he figured out I was happy with that, he got fed up with that routine and started asking for the homework again but I still didn't bother.

In hindsight my grades probably suffered, but only as far as the fact I didn't have all this still drilled into my memory. I doubt it made me any less smart, and instead of doing said homework, I played with my computer which blossumed into a highly paid career.