The first days were fun when renaming and ghost making was discovered and was totally new to jj2. If you hated somebody, all you had to do is spawn a ghost with the name "ban me" (or another offensive name) in their server and wait untill the host falls for the trap (which they usually did). Banning such "ghost" as we call them today does exactly what one would want it to do - it crashes the server.
Renaming was also fun as you could rename a friend of someone you hated to someone he hated and watch the flamewar start. While I can't say I did any of this, I have witnessed others (not telling names) do it many times.

To be honest my first rename was in theWINNER's server when I was still researching packets. I renamed him to a noname... by accident.