Thais believe that wicked people will be reborn as fugly beings called pret who suffer greatly as they eat their own blood and pus. This type of ghost also appears in other cultures and is called by different names. There are different types of pret, each of which is the result of a specific type of misconduct such as being too stingy or taking advantage of people. The idea of suffering for eternity in hell in your birthday suit is just too damn scary.