Somewhere in the 80s in Thailand there were a river lake near Chiengmai. They said that in this lake there were many swimmers that got killed by a "Zaj". No matter how good of a swimmer they are, they will die once they try to swim accross this lake. So far there has been many Hmong great swimmer that died in this lake.
One day a Thai swimmer heard about the story and came over. He then wanted to prove to the hmong that there's no "Zaj" and that hmong are not good swimmer. Therefore, he went in and try to swim accross it. As he got to the middle, he then drawn and disappear and died. The Thai government got involved when they heard about the great Thai swimmer died in the lake. Therefore, they came over and drained the whole lake down to the bottom... and guess what they found.... THree giant Electric EELS...
SO, THERE'S YOUR HMONG ZAJ.. ELECTRIC EELS.