After the mob has entered the cave, they begin throwing stones at the computer. At one point, one of the hurled stones hits the head of one of the actors standing in the front row. The shot is quickly edited to cut away to remove as much of it as possible, but, you can still see the actor blink as the rock goes on the rest of its journey.
Narrator: Mr. Goldsmith, survivor, an eye witness to man's imperfection, an observer of the very human trait of greed and a chronicler of the last chapter--the one reading 'suicide.' Not a prediction of what is to be, just a projection of what could be. This has been the Twilight Zone.
Narrator: What you're looking at is a legacy that man left to himself. A decade previous he pushed his buttons and, a nightmarish moment later, woke up to find that he had set the clock back a thousand years. His engines, his medicines, his science were buried in a mass tomb, covered over by the biggest gravedigger of them all: a Bomb. And this is the Earth ten years later, a fragment of what was once a whole, a remnant of what was once a race. The year is 1974, and this is the Twilight Zone.
Included on volume 17 of Image-Entertainment's DVD collection.
This episode is based on the short story "The Old Man" by Henry Slesar. The story was first published in The Diners Club Magazine (1962).