Hello, I don't think this has been posted before. Well anyway.
To do this you need permission to take stuff from your Guildbank and to change your guild's ''Message of the Day''. This is from Saiket and the credits of this go to him therefore. Change the Message of the Day to
That will make the guild crash. Now download this too _Immunize2008-05-05.zip - FileFront.com/run GuildSetMOTD"\1243"
That will make you immune to this. So change the Message of the Day and take everything in guildbank. Since the guild is crashing you can leave and nobody will see that you stole what their guildbank contained.
It was hard to choose the correct section for this :/, hope this is it
Thanks and bye