If you are a VIP in NaxpGaming (You need to donate $ or vote a LOT to become a VIP) you get some GM commands. One of which is the .hover command.
I stumbled across how to crash the servers because I was thinking if i spammed the .hover command maybe i could fly.
I made a macro that had .hover over and over again till no more could fit. I put that macro on every button on the bar and when i spammed it the server started lagging a lot and BOOM! The realm crashed.
This works on all the NaxpGaming realms that you can get VIP powers on.