I don't remember which was my first, but there's 2 things it might have been for:
1. I called out a GP(or whatever they call them now) for abusing their power and got into an argument with them where I basically insulted them. Thrown in "jail". Jail was fun as heck back in the day back when you could actually chat with other prisoners.
2. Glitching off the map. This was fun as hell. Exploring secret zones, thinking we were learning about what was coming soon. It was pure gold trying to check what admins were online with showadmins and trying to sneak around without getting caught. Also logging off when we see an admin arrive. Pure gold.