Comment by dredmorbius

C.f., Agloe, Mountweazel, Steinlaus, and esquivalience:

<https://en.wikipedia.org/wiki/Fictitious_entry>.

Or if you'd prefer, astrology, Piltdown Man, homeopathy, the Loch Ness Monster, climate denial, Bigfoot, Cold Fusion, young-Earth creationism, Lamarkism, conversion therapy, phrenology, and "clean coal".