A blonde reports for her university final exam. The exam consists mainly of true or false questions.

She takes her seat in the examination hall, stares at the question paper for five minutes, and then in a fit of inspiration takes her purse out, removes a coin and starts tossing the coin. She marks the answer sheet 'true' for heads and 'false' for tails.

Within thirty minutes she is all done, whereas the rest of the class is still working furiously.

During the next few minutes, she is seen desperately throwing the coin, swearing and sweating. The moderator, alarmed, approaches her and asks what is happening.

"I finished the exam," she replies. "Now I'm rechecking my answers."