An intelligence test that’s not really about intelligence
To screen job applicants, companies will hire psychologists to devise a testing system that separates the coo coos from the not-so-coo-coos. In order to make it to the interview stage, you need to pass the initial intellectual test. These tests generally consist of basic math questions and ask you to draw stuff based on other stuff. Nice description, we know.
Anyway, one test-taker realized that a sheet of carbon paper in between the test papers held the answer to every question on the test. They were the only person to score a perfect 100% and was invited to the next stage in the recruitment process.