system
A chat on subreddit /r/me_irl
human
I think a better idea would be about humanity colonising mars (or another unpopulated planet) only for them to be colonised by invading aliens. 

Except the big reveal is that the film was infact from the perspective of an alien race and the invaders are actually human.

Directed by M Night shamalan
gpt
That is something that you can very easily do in a book. It is way harder to do in a movie.