One day in high school I found myself in the Principal's office for reasons I don't remember, and the Assistant Principal was chewing me out about something-or-other, and she decided to call my parents and leave a message on their answering machine.
After leaving the office, I remembered that my mom gave me some weird laminated card with codes on it that I could use to call home and play answering machine messages back remotely. I noticed to my delight that I also had the option to erase messages. That day at lunch, I used the pay phone near the cafeteria to call my house and delete the messages on the machine. There were two messages, and I decided in a panic to delete them both without even listening to them first.
I've always wondered what the other message was...