Check the disc and the box art and the manual for any hidden codes that were included for weird metagame stuff.
Also, when you fight The End in Snake Eater, save, jump the system's internal clock by one week, and come back. The old guy will have died of exhaustion.
Also, when you fight The End in Snake Eater, save, jump the system's internal clock by one week, and come back. The old guy will have died of exhaustion.