How do I stop it? A post-quiz riddle. Hand in the quiz, I hand you a mind twister. Kids read, then proceed to sit dumbfounded (and silent). They've got something to chew on while the rest of the kids test-take. Periods later in the day, a few students STILL have their mini sheets trying to decipher the answer. I pass them to other teachers I catch in the copy room and we've got a topic to discuss for the rest of the day.