I was at a new high school and I was taking my first AP class (world history). The day before the exam, the teacher passed out the test and gave us 5 minutes to look through it before picking it up, as a nice gesture to help us know what to study for.

Well this one guy managed to sneak the test out, and the next day he offered to give me the answers. Me, being honest, passed on the opportunity, but he gave the answers to a few others in the class.

Out of 70 questions, I got something like 55 of them right. It was a tough test. I found out the dude who cheated got something like 40 questions right. The dumbass took home the exam, looked up the answers, and barely got over half of them right.