They do silly exercises where you are supposed to read all the instructions prior to starting, and one of those instructions is to not do the worksheet at all, or not do a major part of it.
I remember we had an exercise like this in ~5th grade or something and I *did* read all of the directions and the *last* one was to not do any of the above. I thought the correct way to proceed then, was to follow all of the directions in order, because otherwise you were picking and choosing which directions to follow, which of course could not be the right answer either. I still think there is a logical flaw in that sort of exercise, unless the instruction to not do something comes before the list of something that you are not supposed to do. And it still annoys me that I got in trouble for it. Oh well.