10 Movies That Would Work Better As Horror

10. Bull

The British crime drama follows a ruthless enforcer called Bull. After being left for dead by his former gang a decade earlier, Bull returns to his old town to exact revenge on them. He picks off each gang member one by one, before ultimately killing their leader, Bull's father-in-law, Norm. 

In the final scene, a priest becomes horrified when Bull enters his church, accusing the gangster of being an abomination in the eyes of God. It's then revealed that Bull has pure black eyes, indicating he harbours demonic power.

Through a series of flashbacks, it's explained that Norm's gang shot Bull dead ten years ago and buried his corpse. With his soul unable to rest, Bull made a deal with the devil, allowing him to return and slaughter his killers.

Even though this is a harrowing revelation, throwing in this spooky element in the last two minutes of a grounded thriller feels out of place. The film could've avoided this by incorporating more grisly kills or referencing devilry and black magic.

If these horror aspects were sprinkled throughout, the last-minute twist wouldn't feel tacked on.