PlayStation 3

These cover 10 well-known spoilers in video games, not all of which are available on PS3. Obviously, this topic will contain spoilers, but hopefully the discussion will be limited to these spoilers, and hopefully they are well-known enough that you can participate in the topic without knowing what the games are.

Remember that this question is asked about the status as of today, i.e. if you mention these to a gamer, which would most likely be a spoiler? This will be an advantage to older games, but notoriety might overcome that.
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"You are an Earthman in whom a preference for the personal presence of an attractive woman is not psychotic." - R. Daneel Olivaw, The Naked Sun

I'd say "Aerith dies". It's like the "It was Earth all along" or "Rosebud was his sled" of gaming, you don't even have to have seen the movie (or in this case, played the game) to know it.

Whereas I have no idea what more than half those other spoilers are.

A pretty big, more recent one you could have had was RDR's John dies at the end.
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John Lennon, 1940 - (Infinite Symbol)
PSN: naathaann

I got moderated for saying 'Aerith dies' a while ago, so apparently that's still a spoiler.

The cake is a lie isn't a damn spoiler.
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http://i.imgur.com/QB2km.png

It's for Diablo 1. There was a rumor about a secret cow level that you can access. The level is in D2 but not D1.

It looks out of place because I couldn't think of a 10th big, really well-known spoiler that I'm comfortable throwing into a general spoiler topic.
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"You are an Earthman in whom a preference for the personal presence of an attractive woman is not psychotic." - R. Daneel Olivaw, The Naked Sun