In 10th grade, Minecraft Pocket Edition had just launched, and everyone played it on the school wifi during class.
One day, after school, I was at a friend's house, and we had a small group playing it. They pissed me off. So I left.
I realized I never disconnected from their wifi. So I snuck behind their house and changed my username.
I joined, disconnected, changed my username, joined again, and repeated several times. Several usernames included, Light Yagami, Technical Testicles, and other random things I could think of.
They eventually found me. When I was caught, my username was Miranda The Lesbian.
The next day at school, I forgot to change my username. I decided to have some fun, and destroy people's stuff.
I continued this daily. Eventually, I heard in the hallways, people talking, "We need to find this lesbian chick and beat her up."
I told a few close friends. They kept an eye out for people trying to find me, and would warn me, so I was always a step ahead.
Nobody ever knew it was me, because they never expected I was a guy. They were too busy accusing every girl named Miranda. Eventually people stopped playing Minecraft because of me. And I kept the username for everything else I did online.