The Corpse Grinders (1972)
Just watched this today. It has a great premise: a cat food manufacturer has been grinding up the recently dead to help cut costs on cat food ingredients and now house cats are starting to crave human flesh and attack their owners. Unfortunately the premise is about all this movie has going for it. I was expecting a tongue-in-cheek campfest but it wasn't that really, more of a z-grade snoozefest unfortunately. It had it's moments but overall I can't really recommend it.