What's the film from the late '70s about a psychic, grieving mom who foretells t!

What's the film from the late '70s about a psychic, grieving mom who foretells the deaths of 3 high schoolers?

OK, I need the title of a '70s movie, because it's groovy, yet so obscure. The film is broken into 3 parts, all American ghost stories. The title is actually "America's Haunted Spots," "Ghostly America," or something to that effect. One story is the old yarn about the new (hippie) girlfriend who turns out to be the ghost of a drowned girl. Another tale is the discovery of a Hole to Hell by a little lad in the woods near his home. The most memorable tale, though, begins with a teen-age boy's death after his 3 friends down at the poolhall make him the victim of a cruel and unintentionally deadly prank. They attend his funeral, where his grieving mother makes a sudden prediction: "Five times around go the 3 of you! One by air, 2 by land!"
And, sure enough, 1 boy dies soon after, in a car accident. A 2nd death occurs when a plane crashes 5 years later, carrying 1 guilty boy. And as the ambulance rushes to the runway, it veers and strikes the storyteller, fulfilling the prophecy

...oh, jeez!!! You have absolutely no idea of the memories this movie invokes, as far as late night creature-feature viewing!!! I haven't thought about this chilling flick in years, and yet, I've had it in my movie collection for probably just as many years!!!

You're oh-so talking about the macabre, prophetic and spine-tingling shocker, entitled "Encounter with the Unknown", from 1973, and you're absolutely right; the other two stories are faily pat and O.K., but the story regarding the curse placed upon the cruel, prankish teens, by the grieving mother at the funeral, was quite nightmarish.

Thanks ever so much for reviving this cinematic memory!!!

...check out the webpage for the film, below...