As horror is the genre most closely associated with cult classics, Evil Dead 2 wins out every time for cult films in my book.
![Grin ;D](https://www.susans.org/Smileys/susans/grin.gif)
Honorable mentions: Night of the Living Dead, Dawn of the Dead, Evil Dead, Army of Darkness, Re-Animator and all of the assembled Lovecraft inspired movies that almost always had Jeffery Combs, Bubba Ho-Tep (there's a Bruce Campbell theme to my movie choice
![Grin ;D](https://www.susans.org/Smileys/susans/grin.gif)
), Event Horizon(it's a really good bad movie), anything by John Carpenter with special shout out to They Live.
Skipping the most obvious long running franchises that got ran into the ground and then trampled by a stampede of elephants being chased by Bigfoot (the monster truck, not the sasquatch) who was being driven by Hulk Hogan on flakka. I'm looking at you Wes Craven's ghost.