Many horror fans have strong stomachs when it comes to shockingly terrifying content in movies, but even the steeliest of us has seen movies that have tortured our psyches with endings that leave no silver lining whatsoever, leading horror fans to discuss the darkest movie endings they've ever watched. Don't worry, we won't spoil any of the details.
The person who started the Reddit thread that sparked the conversation called out the notoriously tragic ending of The Mist, which seems like a very natural fit. In terms of subsequent picks in the comments, right at the top is Eden Lake, which, by comparison, feels less upsetting to me than some subsequent choices.
