I still the remember the time when people were farming abyss gems for money and this one dude came and asked me for clan back when there were only few "caped" clans.
Anyway I told him to give me his gems then go to breth.
Took his 4 abyss gems which probably took him some time to get :\ and just stayed in the abyss while he went to breth :\
Not something I'd be proud of today.
Also used kohack back when it had only autoloot and open inn/stores, which I got from a clannie at the time, someone most of you might know ^_^
Too lazy to check if he posted here already.
Lastly, KO was actually the first MMORPG I ever played, so I'm sure I've done some more crap which I can't remember now :|