The Gate (1987) Kids uncover a portal to Hell in their backyard and unleash hordes of stop-motion monsters. It's Goosebumps meets The Evil Dead, but in a good way. TIL: Hell's attacks are usually a bit more subtle than dead men in the walls, but hey, I wouldn't put it past them.
Your daily dose of culture courtesy of Get Crazy (1983) - "The devil ain't got no music. All music is God's music." - Mavis Staples