Kaosu Buntai
A group of password crackers who crack mainly InvisionFree boards. When a board has been "infested" the Kaosu Buntai usually leave a pinned topic on the board showing the current members or the other infestions.  This group claims they stand up against abusive administrators but that is unconfirmed.  How they obtain the passwords is unknown.
Your board has been infested by the Kaosu Buntai.  Have a nice day.
The Kaosu Buntai loves you.
The Kaosu Buntai was here.