I once wrote a final exam for a linear algebra course with a section "all the following are false, explain why." I did it to make it easier than a T/F, but it w

I once wrote a final exam for a linear algebra course with a section "all the following are false, explain why." I did it to make it easier than a T/F, but it was unintentionally devious. So many students said some of them were true anyway and tried to prove them...