Ratu Udre Udre (pronounced [ˈunreˈunre]) was a Fijian chief who holds the Guinness World Record for “most prolific cannibal.” During the 19th century, Ratu Udre Udre reportedly ate between 872 and 999 people. He kept a stone for each body he ate, which were placed alongside his tomb in Rakiraki, in northern Viti Levu. According to Udre Udre’s son, the chief would eat every part of his victims, especially the head, preserving what he couldn’t eat in one sitting for consumption later.
Doesn't Guinness have the option listed somewhere to "break this record". Just thinking about that is making me laugh.