10 Movies Where the Plot Changes Halfway Through (MovieWeb)

"Oddly enough, just about every genre possesses a film that starts out as the assumed category before ultimately throwing a curveball at the audience. But it's not just a twist in the narrative, it's a twist in what the film is. But these aren't genre-blenders. Instead, these are movies that definitively present themselves as members of a particular genre, be it science fiction, comedy, action, drama, or horror, then become something else entirely (including one of the aforementioned categories). Some directors pull it off better than others, but each of these movies is both worth watching as a whole and arguably worth watching just for the genre shift. The latter half may not be as entertaining or meaningful as the former, but it's always admirable when a movie tries to be something a little bit different." - movieweb.com