“What happens when a serial killer who kills hitchhikers picks up a serial killer who kills the people who pick her up?”

No, that’s not a riddle (or the set-up for a joke on a very macabre popsicle stick). It’s the premise of a short horror film called “Pretty Little Miss,” based on a story by Reddit user JeniusGuy.

Six months ago, JeniusGuy crafted a story for the Writing Prompts community, imagining what happens after the two serial killers are sitting in a car together, each plotting to kill the other.

On Wednesday morning, the user shared an update on Reddit: Their short story is now a short film, written and directed by Robert O’Twomney:

The film balances the expected suspense that comes with putting two serial killers in a car together with some less expected comedic bits.

The result is a mix of familiar tropes from horror films—car trouble, a news broadcast about a serial killer on the loose, thunder and ominous music intermingling on a rainy night by the side of the road—and dialogue that ventures into sillier territory (“What the fuck, you have a knife too?”).

The crew behind the film includes a few other collaborators sourced from Reddit, as JeniusGuy reveals in a comment:

This wasn’t the first time a Reddit user’s short story caught the attention of a director and provided the basis for a professionally produced film.

Two years ago, Adam Spielman (user DrowningDream on Reddit) wrote a piece imagining what heaven would be like with Lucifer in charge, which director Fangso Liu adapted into a 15-minute short starring comedians H. Jon Benjamin and Natasha Legerro.

To read the original story that inspired “Pretty Little Miss,” check out JeniusGuy’s original Writing Prompts thread.