Aight I found this today , if I was you I wouldn't use this because it can get your account banned and all but still I thought I would share it with you and let you decide what you want to do with it .
Ok so first you need a lvl 20 rogue ish ( can be done with others thing but rogue is much simpler ) and 1 more (any lvl and any class work ) you gotta have poisons , what you do is you start applying poison on a grey or white weapon and you open trade with the other guy , when you are applying the poison you put the weapon in the trade window ... the other guy click on ' trade ' so his part of the trade window become green , after when there is 0,2 sec left on the applying of the poison you hit ' trade' too so both trade windows are green , it will get stuck and freeze for a few sec then it will crash the server ,,,,
Have fun with this ,,, btw remember if I was you I wouldn't do this