Spider Baby (1964, but released in 1968) - 7/10
Another of my annual Halloween viewings, this is a very strange low budget indie film starring Lon Chaney Jr., and it's one of Sid Haig's earliest film appearances (yes, he was bald even then). A dilapidated mansion is inhabited by the three surviving children of the Merrye family - all of whom suffer from a form of mental regression - and their caretaker. Some "normal" distant relatives show up with a legal claim to the estate... little do they know what they're getting into, and all hell breaks loose.
I love it. It's definitely a cult classic and should be seen at least once.