Your ancestors at dead people. I mean beyond the Donner Party, that movie Aliev, and Hannibal Lecter.
Whenever famine has reared its ugyly head, humans have, however reluctantly, taken to eating their own kind. But I am not even talking about that.
In ancient times, all the "smart" people considered it healthy to eat or drink parts of the dead--especially mummies. Sometimes they rubbed stuff like human fat on their skin. ( "...Or it gets the hose again...")