I recall reading about a published Call of Cthulhu scenario which had the following premise:
- The characters started in an area where they were the only people around
- A dead body was in front of them and one of the characters was eating a tongue (less sure on this point)
- All characters had amnesia and could not remember their past or how they got there
- The players all started out with blank character sheets
The idea was that without a past, the characters had to find out more about themselves and would fill in the character sheet as they went along and discovered their abilities. I first heard about this scenario at least five years ago. I asked a Chaosium employee about this adventure and they seemed to recall that it existed, but didn't know the name or what book it came from.
What scenario was this, and what version of Call of Cthulhu was it made for?