You said you tried a couple of these out the other day, which ones did you try?
It wasn't an exam more like a pop quiz, but many years ago I wrote "Work it out yourself" for every answer, handed it to the teacher and walked out of the class room. I can't remember why but I think it was for being ****ed off at the teacher for attempting to confiscate something of mine.
I did the one where u cover all answers in black marker, the one where you keep moving seats every 5 minutes and the one where as soon as the instructor gives it to you eat it which went down a treat