Not entirely dev related, but definitely shameless. In high-school we had to study CS, but it was more about knowing to use Office. We had class tests, which mean that we all had the same task and we had to finish it until the end of the class. Obviously no one wanted to do it, so whoever finished first would email it to everyone. Most people, however, were stupid enough to leave the meta data untouched, so it was obvious who was the original author. To not appear suspicious, I removed the original metadata and put my own in, and deliberately made errors in the sheet and corrected others that I noticed. I never got caught, because my work would always have "unique" mistakes.