The Haunting was 60s. I finally got a copy on Ebay. Also have two copies of Day of the Triffids.

Does anyone remember a film called "Univited"? Not "The Uninvited" with Ray Millan. This one may have been a Thriller episode. A man is an expert on electricity. He traps his wife and her lover in their home shoeless.with the warning that anything they touch may electrocute them. The lover grabs the phone - ZAP! She disappears.
The story opens with a young couple looking to buy the house. The real estate agent tells them the story and then fades into the walls - she is the wife. Scary stuff. I don't think they bought the house.