I got my mom really good one year. I was a senior in high school, went to the office and asked for a piece of letterhead, typed up a letter saying that I won't be graduating due to my grades and absences, had my friend's mom sign the letter, and then put it on the table for when she got home that day. OMG was she mad!!! Yelling and carrying on. I couldn't keep a straight face and started laughing. She had to call my friend's mom and verify she actually signed the paper.