Last night after raiding i thought i would try and crash the server with this trick. It didn't work, but i found out somthing else.
After clicking on 2 FLYING (they seem to cause more lag) pets for 2-3 min I made close to 1,000 {a guess}. When i moved about 5 yards from my original position where i spawned them in the bank I disconnected, ALONG with 4-5 people in my guild that were watching.
So basicly, make A LOT of pets, run around, and watch people disconnect/lag (it all depends on how many you make =D)
EDIT: i forgot, it also depends on how good their computer is. If it is bad they probably WILL dc, average it is likely, and if it is really good it will lower your FR by around 15 or so.