Don got the first season on Gilligan's Island from Netflix. There's a show I never saw all the way through. The Lost Pilot, featuring a different professor and two completely different young women ("secretaries from the United States," as the alternate theme song describes them), is especially trippy.
In the first episode, some of the castaways set an elaborate trap involving a cave, a vine, and some precarious rocks. Some other castaways stumble upon it. What might happen?
At first sight of the cave -- before any of the castaways mention it -- Ulysses pointed, with excitement, and said, "Cave!"
Where did he learn that? Dunno. I expect that'll start happening more often.