I don't know how much expertise you have, but I've always wanted to do this ... but I have no talent.
Anyways, read the short story "Prey" by Richard Matheson. He's the writer of "I Am Legend". It's included in the "I Am Legend" book.
There's action and what I would call, "dark" humor. You could do that story for your movie.
Anyways, I don't know copywrite laws and such, so you might be out of luck ... but you could always do a movie that's inspired by "Prey".
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