A young student reports for a final examination that consists of only true false type statements. The student takes a seat in the hall, stares at the question paper for five minutes, removes a coin and starts tossing the coin and marking the answer sheet.
Heads means true, tails means false.
The young student is all done in 30 minutes while the rest of the class is sweating it out. But, suddenly, during the last few minutes, the young student is seen desperately throwing the coin, swearing and sweating. The moderator, alarmed, approaches the student and asks what is going on. Five surgeons were taking a coffee break and were discussing their work. You open them up and everything inside is numbered.