I had a professor in college who would do 10 question pop quizzes from time to time. He would always have the answer key stapled to the front of the envelope as he passed them out. I have good spatial recognition and would always crack a joke to him when he got to me just so he’d pause for a second and I could memorize the pattern real quick. I’d fill out the answers in under 30 seconds and just pretend I took it.