I proctored an exam once in an auditorium. You could kind of see over the person in front of you's shoulder even though they sat every other seat or whatever. I'm pretty sure there was a group of friends sitting in a six deep echelon formation as some kind of cheating daisy chain but I could never prove it.
I took an exam once. Guy next to me seemed to be looking at my paper but I wasn't sure, so I stayed quiet. Later in the exam, I got stuck on a problem or made a mistake, and he tapped me on the shoulder and told me the answer. Remembering that just now made me smile. This wasn't a high stakes medical school type of thing though, just a normal classroom quiz.
