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I’m not sure I’ve seen that movie but I do remember one where some kids (or one kid?) rode bikes into an old quarry. I grew up near old quarries in southern Ohio and heard the same things you mentioned, and likewise never did those things. My Aunt worked at IU in the 60s, I am going to ask if she ever heard about this if she can remember. She was a librarian there.
What?! That’s incredible. I think I can say with confidence it wasn’t my Aunt 😬 Incredible story, I’m going to ask.