The blonde reported for her final examination which consisted of Yes/No answers.
She takes her seat in the examination hall, stares at the question paper, and then in a bit of inspiration, takes a quarter out of her purse. The blonde then starts tossing the coin and marking the answer sheet “Yes” for heads and “No” for tails.
Within 30 minutes she’s all done whereas the rest of the class is sweating it out. During the last few minutes of the exam period, the blonde again frantically starts flipping the coin again.
The moderator, concerned about what she’s doing, stops by and asks if she’s ok.
“Oh yes, I’m fine. I finished the exam a half hour ago — but, ” explained the frantic coin-tossing blonde, “I’m going back thru and checking my answers!”