I would have to erase Bioshock.
Before I bought the PS3 I kept looking up facts about Bioshock, and kept reading on it until I already knew the major story without even playing. It did not spoil the game for me, because seeing the story retold with what went on in Rapture was really cool. I would love to experience all again, not just to see it without knowing anything about it before hand, but to revisit all of the really cool moments of Bioshock. There were parts of the Medical Pavilion that were really cool. There are the splicers you think are dead, but then move when you are not looking in Fort Frolic. It would be so cool to reexperience that.