Two brothers accused of shooting up a Blue Mountains pub after threatening another patron claim they instead went home to watch the romantic blockbuster Titanic.

Nathanael and Aaron Hayes, 26 and 25 respectively, were allegedly involved in an argument with two patrons at the Gardners Inn in Blackheath on the night of September 5 last year, with the younger brother accused of making threatening gestures towards one of the men as the accused pair left.

Nathanael Hayes (left) and Aaron Hayes (right) are charged over a Blue Mountains pub shooting. Credit:Instagram

According to a police statement, the brothers were allegedly caught on CCTV returning to the pub hours later before, investigators say, they took turns firing homemade guns at one of the men, narrowly missing his head.

"I want to show him who he's f---ing with," Aaron Hayes allegedly texted his girlfriend upon returning to the pub and shooting at the man.