It doesn’t quite fit into the “moon is made of green cheese” idea, because of the reference to personal experience.

The moon being made of green cheese probably deserves a geezer alert >50 years past the US moon landings, but a day later here it is again, in a non-CIDU.

Where did the green cheese idea even come from? The old theory that birds migrated to the moon made some sense centuries ago, but green cheese?