alt Hacker NewsBack in high school a few kids would be tempted to insert a sentence such as "I bet you don't actually read all these papers" into an essay to see if the teacher caught it. I never tried it but the rumors were that some kids had got away with it. I just used it to worry less that my work was rushed and not very good, I told myself "the teacher will probably just be skimming this anyway; they don't have time to read all these papers in detail."
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Like the invisible gorilla?
This reminds me of the tables-flipped version of this. A multiple choice test with 10 questions and a big paragraph of instructions at the top. In the middle of the instructions was a sentence: "skip all questions and start directly with question 10."
Question 10 was: "check 'yes' and put your pencil down, you are done with the test."
Aerosmith (e: Van Halen) banned brown M&Ms from their dressing room for shows and wouldn’t play if they were present. It was a sign that the venue hadn’t read the rider thoroughly and thus possibly an unsafe one (what else had they missed?)