It's amazing, but also not.

I remember back to high school, when people would cheat off my paper for Mrs. K's Biology and Physiology classes. Mrs. K. was no dummy, either. One girl, a lab partner of mine who always panicked at test time, especially pop quiz time, was particularly enterprising. One day we had a pop quiz, and it was simple multiple choice, so the answers were just a column of letters. Mrs. K. realized I was done, so she walked over and picked up my paper. As she continued walking around the room to supervise, she held my answers behind her back and upside down, so Robin followed her around turning her head to read my responses, before dashing back to her seat. I was astounded that she didn't get caught. Mrs. K. caught other cheaters throughout the year, and was never amused. Any cheating resulted in a zero for that quiz or test, which of course wreaked havoc with one's grade. Three girls a year older than I ended up having to do massive extra credit work when their cheating scheme was discovered - they barely passed that term, when they were usually honor roll kids.