There was a PK glitch in one of the guild houses where one person ran out of the water onto stairs that led to the land and one player would stand at the end of those stairs giving the player just enough room to stand on the stairs, then if you just spammed your sword and had your friend run up the stairs they would rapidly lose health and die in no time.
We did this and had an admin pop in to ask what was up lol, we got a verbal warning not to do it again.