You awake in a grave, with no memory of who you are or what happened to you...
You know what that reminds me of? Roger Corman and his Poe filmes from the 1960s. Escaping from your own grave after premature burial might make for a cool game – Corman's Premature Burial even unknowingly suggests some puzzles in the scene where the protagonist explains the safeguards of his crypt and the dream sequence when all of these safeguards fail would be a good blueprint to design a game around.
