Perhaps its about the DnD kid? I vaguely remember hearing about that, in the early days of DnD there was a college kid in Michigan who disappeared, and it was thought he had been in the steam tunnels under the campus as part of a DnD campaign or something. I don't remember all of the details, or if it ended up being true, but I think it kind of became a trope surrounding DnD for a while, and there was a Tom Hanks movie about it.