A surreal movie in color most likely from the late sixties or early seventies, but no later than 1976.

The movie was full of absurd, grotesque or shocking imagery, but I only remember one thing:

A smooth oblong polished rock lands on a guys head and embeds itself there, with brains and blood slowly dropping down from the wound with the big rock as the guy just stands there. He had a military uniform, I think, and was maybe 30 years old.

That’s all I remember specifically, but there was other weirdness which I’ve forgotten. I think it was about a family in some way. I saw this movie while I was in the hospital with the flu in the winter of 1977 (I survived). Probably not the best thing to watch as a feverish 12 year old.

It was broadcast on a non-network station out of Philadelphia or New York. It was in color. It was pretty shocking stuff to see on TV, but I guess the movie couldn’t have been too extreme, since it was broadcast in the middle of the afternoon in the middle of the seventies.

The movie has been hunting me ever since.

Any clue?