The creepy, kooky Addamses’ invitation to the wrong family reunion should occasion some funny lifestyle clashes. But in Addams Family Reunion — a straight-to-tape threequel — the humor is as crude as the low-rent special effects. Among the few good sight gags: the chalk outline of a dismembered body on the hallway floor and little Wednesday mixing quicksand in her ”normal” playmate’s sandbox. More often, though, the giggles are supposed to come from exploding tennis balls, electrocutions, and a demonic dog with a taste for hair not his own. As Gomez and Morticia, Tim Curry and Daryl Hannah are okay, but they can’t match Raul Julia and Anjelica Huston. Hell, they’re not even as cool as John Astin and Carolyn Jones. D+