Apropos of nothing:
'A proctor administers an exam to a less-than-keen student. The entire exam consists of multiple choice 'true or false'-style questions. The proctor observes as the student reads the first question, hesitates, flips a coin and then pencils in his answer. He does the same for every question thereafter.
'When the exam is over, the proctor notices the student is still flipping his coin. So he says, "Why are you still flipping your coin?"
'The student looks up and says, "I'm checking my answers".'