We just found out about the arena on s.nerd.nu where players fight each other for prizes and virtual reputation. Of course, our first thought was to turn invisible and kill people in the fights so they'd get angry. Then we found out that the arena doors are controlled from the inside of the area, so we started opening the doors during fights and causing free-for-all brawls while the admins tried to fix the redstone circuits. Oh, Reddit, you're so amusing.