THAT ACTUALLY HAPPENED TO ME. At the end of Spanish 1 in high school they handed out a standardized test, face down. I TIED WITH THE HIGHEST SCORE--70.

When the teacher was returning the tests she asked me--"Why did you leave off the THIRTY-POINT question on the back?"

I had ASSUMED that since the tests were handed out face down, OF COURSE there wouldn't be a QUESTION there ...