Sorry to Poe and Adams, but MM got there first:

Muggeridge’s Law: there is no way that a writer of fiction can compete with real life for its pure absurdity.

Poe's original law said: "Without a winking smiley or other blatant display of humor, it is utterly impossible to parody a Creationist in such a way that someone won't mistake for the genuine article."

The same happened to Muggeridge:

When Malcolm Muggeridge was the editor of the British satirical magazine Punch in the early 1960s, Khrushchev had announced he was going to tour England alongside its prime minister. Muggeridge wrote up a list of the silliest tour stops he could think of, and then put the article to bed, ready for publication. When the actual tour list was drawn up, he had to massively rewrite the article. At least half the tour stops in his satirical piece were actually on Khrushchev and the British PM’s agenda.