Not intentionally, but in high school we had a test on identification of flowers and plants. The teacher was an older man and he wasn’t good with computers. He was showing pictures from the computer using video projector but didn’t realize that Windows was displaying the filename of each picture in the title bar and each picture was named e.g. “daisy.jpg”. Almost the whole class got full marks on the test except for the unlucky few who sat in the back row and had poor eyesight.