A few years ago I bought a second-hand copy of a book called Secrets of our Spaceship Moon by Don Wilson. This was first published in the USA in 1979, but the copy I bought was the British Sphere paperback from 1980. Inside it I found a newspaper clipping from the Sunday Mirror (a downmarket tabloid here in the UK) dated 9 September 1979. Headed "Moon Aliens: Riddle of two UFOs in crater as Apollo made historic landing", it cites various dubious pieces of evidence suggesting that Neil Armstrong and Buzz Aldrin encountered extraterrestrials while they were on the surface of the Moon in 1969 (see scan below -- click on the image for a larger version).
You might think that all this comes from the author's imagination, but actually all the claims in the book are carefully referenced to third-party sources. It's just that the sources aren't especially reliable. The information about the metal shavings, for example, comes from an unnamed "high school student". Now call me an old cynic, but I don't find that overwhelmingly conclusive. And one of the sources for the Apollo 11 UFO sightings is Otto Binder, described by Don Wilson as a "former NASA researcher and writer". I'm not sure about the "former NASA researcher" part, but Otto Binder certainly was a prolific writer. Most of his output was science fiction, written under the pseudonym of Eando Binder (originally shared with his brother Earl: "E and O Binder").