A joke by my AMA prof:

There was this law prof in some uni that allowed his students to bring in an A4 crib sheet for exam. When asked what was allowed on the crib sheet, he replied: “Anything, as long as it is within the A4 sheet.”.

During the day of exam, one of his students brought a blank A4 paper into the exam hall. His friends were shocked as they had all filled up their papers with words, leaving no blank spaces. The guy with the blank paper looked confidently at the exam entrance and waved frantically at a petite lady. He then placed the blank A4 paper on the floor as the lady walked towards him. The lady, one of the top lawyers, fitted nicely onto the A4 paper. The guy got A+ for his exam.