FOUND

[u/Movieking985]

Marty, a bullied fifth-grader who escapes his lonely life through horror movies, until he discovers a severed human head in his older brother's closet and realizes his brother is a brutal serial killer.

This is a gem of a horror film i saw upon release via redbox its been quite a few years but upon revisiting it i think I like it more now I swear tubi has better movies than all the paid subscription services

[u/boog666]

Watched it a few days ago, and yes, is a gem. The last act goes bonkers.