I want to direct a movie where the trailer shows only zombies, and the first five minutes are indeed the standard prelude to apocalypse. But then, five minutes in, patient zero is shot and the rest of the movie is a romantic comedy and people only find out in the theater. (Thus far, the idea is inspired by xkcd)
Then, there will be a sequel, which is an hour and a half of romantic comedy, until at long last having surmounted the usual misunderstandings, obstacles and temporary tribulations of fate, the protagonists meet on a moonlit beach to kiss….which is when the aliens attack.