I really think that the famous legend of Px is the most awesome and problematic thing ever happened on a MMORPG.
The name of the character was Px. Weirdly enough, his name was that back in the 2000 (you were allowed to own such names back them). In short, he discovered that typing "ae" (yeah, ae only) in the chat of Tibia would deliver to him random username and passwords (!!!!).
Yeah, the case is an absurd itself, but it really happened. There is a lot of discussion about this
The guy who had this char told everything about it here. "ae" is a common thing to say between the brazilian community, but somehow the word ae posted by the char px was a combination that led the system to deliver to this char a message with 2 account numbers and passwords!!! He realized that everytime he posted ae on trade channel, he would receive new accounts and passwords!
There is no explanation about why it happened. The owner of this char explained all of it here in a long livestream:
https://www.youtube.com/watch?v=cDp6p8H6aZc
There are a few videos about him, but only in portuguese! You can ask to the former owner of Px in the link above if you wish, I really recommend because there is no content in english about him.
This guy can be potentially the sole cause of the famous "mass hacks" of the past, where people got robbed several times without any explanation or reasoning at all.
Here is a full text from an official fansite article about the case (in portuguese too): https://portaltibia.com.br/o-curioso-caso-de-px-mais-uma-lenda-tibiana/
Px was a player from Eternia, and the whole case started in 2003. I wasn't a Tibia player back then, but I wonderif people outside the brazilian community knows anything about that. The player used to steal account in Cyber Cafes, with crowds of people behind him and also made a lot of money selling items from Tibia.
Nowadays, the character is long gone due to a Tibia investigation that started after some time that the whole case reached the peak of hackings.
I really can't even imagine how this can be credible, but the guy got a lot of sources to sustain his claim. Here is anold image from his photolog with his first hack (got from the article posted by PortalTibia):
