I remember being pretty terrified by this "children's" film back in those long-ago elementary school days. The AV slave would thread it up, and we'd all sit transfixed and shuddering until it ended, and the slapping of the loose film against the projector sounded like a thousand raven's wings. Anyway, super scary...but literate!
Several sources list it as "banned" but I don't think good judgment in program selection is the same as official banishment. Anyhoo, it's melty message changed my life forever. Beware!