I haven't seen The Crying Game, so I really couldn't comment there.
As for Agatha Christie, the title and genre of the work are indicative of the content... the reader knows that this is some sort of murder to happen, and some sort of twist in the end. Writer reputation also plays a part, there, which doesn't happen in fanfiction, for the most part.
Even someone like JKR (to get back on my HP bandwagon) mentioned before the release of OotP that someone was going to die -- probably as much to generate the 'who will it be?' as to prepare people for the fact that someone WOULD die. That definitely didn't make the ending of the story any less of a surprise.
Re: *laughs hysterically*
As for Agatha Christie, the title and genre of the work are indicative of the content... the reader knows that this is some sort of murder to happen, and some sort of twist in the end. Writer reputation also plays a part, there, which doesn't happen in fanfiction, for the most part.
Even someone like JKR (to get back on my HP bandwagon) mentioned before the release of OotP that someone was going to die -- probably as much to generate the 'who will it be?' as to prepare people for the fact that someone WOULD die. That definitely didn't make the ending of the story any less of a surprise.