I've actually pitched this one. But I feel like it deserves to be here.

Idea:
You get a large group of people in a horror setting. Their job is to survive as long as possible against the odds. But if they do die, they return as (spirits/zombies/what have you) and try to kill their friends. Basically the idea was to see if anyone survives the night. Because it would be a relatively short RP with time stamps and when "night" ended the RP would end.