What's the biggest bad thing you've ever done in your life?

I am in the second grade of junior high school. In the first three periods, I was ranked second in the class. The first place was taken by the monitor, a pretty girl with two ponytails. I feel a little unconvinced. In addition to studying harder overtly and secretly in the hope that her grades would surpass hers, one day she suddenly made a damaging move on a whim. I wrote a few words on a piece of paper, something to the effect of "You know, I've secretly liked you for a long time." But I didn't sign my name, and the font was deliberately horizontally and vertically unlike mine. , and then secretly tucked the note into her textbook during the break. It happened that the next class was using the same textbook, so I saw her turn to that page and see the note. She was obviously stunned. She scanned the classmates back and forth with her eyes, as if she wanted to see what was going on. Of course she couldn't tell who wrote it for her. Then she got a little distracted during that class and kept looking around. It wasn't over yet. I gave her a similar one every one or two weeks that semester. I don't know if the notes that read "I've been paying attention to your every move" and "I saw your heart beating so fast" had any impact on her. In short, I finally got the first place in the final exam of that period. She could only settle for second place. It wasn't over yet. Later I admitted to her and admitted my mistake, and then we became each other's first love.