I was at work the other day and this story came up and I thought I would share it with you guys.
When I was a sophomore in college one of my professors told the class at the beginning of the year that she posts all the answers to the tests outside of the classroom on the day of the test. The catch was, there was 4 different tests she would pass out (scan-tron) and she would post all the answers to all the scan-trons outside of the room, only you didn't know what color scan-tron you would get. I then brewed up a plan. On the day of the test I called my cousin and asked him to come to my building. Once I was inside of the room, I would get my scan-tron and then text my cousin, who is outside of the classroom, and tell him that I got the blue scan-tron. He then just walked up to the posted answers and just went down the list on the blue scan-tron giving me the answers adbdcabac.. and so on. I did this for 3 tests in that class and walked with an A, I also stopped going to class once my scam turned out successful, and it was an 8am class.
I should also note that it wasn't actually a classroom but rather an auditorium and the class size was around 600 people, so that made it much easier to get away with.