How chain emails and viral posts became folk etymology

If you have ever been told that people in the old days shared one tub of bathwater from eldest to youngest, and that by the time the baby’s turn came the water was so filthy you could lose an infant in it — hence “don’t throw the baby out with the bathwater” — you have met one of the most successful pieces of misinformation in the history of the English language. It is not a folk memory. It is a forwarded email, and its career tells you almost everything about how false etymology now spreads.

The document at the root of it

Many of the most confident word-origin “facts” in circulation descend from a single text, an email that began doing the rounds in April 1999 under the title “Life in the 1500s”. It is a long list of everyday phrases, each supplied with a squalid or startling explanation supposedly drawn from Tudor domestic life. Thatched roofs full of sliding animals gave us “raining cats and dogs”. Dirt floors gave us “dirt poor”. A shared bath, drained last for the baby, gave us the bathwater proverb. The piece is written to be enjoyed and passed on, and pass on it did, mutating slightly with each forward, sometimes retitled “Life in the 1600s” or dressed up as a “little history lesson”.

Almost none of it is true. The fact-checking site Snopes examined the compilation and rated it a collection of invented etymologies; it reads, on inspection, as comic writing rather than research, a string of just-so stories with no citation behind any of them. Yet because it arrived in the inbox looking like a tidy reference document — numbered, confident, faintly educational — a great many readers filed its contents under “things I now know”.

Why the bathwater story is the perfect specimen

Take the bathwater proverb, because it is checkable. The phrase is not an English observation about Tudor hygiene at all. It is a translation of a German proverb, and its earliest recorded appearance is in Thomas Murner’s satirical work Narrenbeschwörung (“Appeal to Fools”) of 1512, where throwing the baby out with the bath is already a set figure of speech for discarding something valuable along with something worthless. It entered English much later as a borrowing. The shared-tub explanation is not merely unproven; it describes the wrong country, the wrong kind of source and the wrong mechanism. The proverb was a proverb — a deliberate image coined for effect — long before anyone attached a story about grimy water to it.

That is the pattern the whole “1500s” genre follows. A real-sounding domestic detail is invented or exaggerated, then bolted onto a phrase whose actual history lies somewhere else entirely, usually in literature, in another language, or in a figurative image that never needed a literal backstory at all.

The same email supplies the thatched-roof account of “raining cats and dogs” (animals did not shelter on the outside of a wet roof, and the phrase is a seventeenth-century figure of speech), the notion that “dirt poor” describes literal earthen floors, and a string of others in the same key. None of them survives a look at the dated record, yet all of them still circulate as detached “facts”, cut loose from the joke that first assembled them. The compilation is the disease; the free-floating individual claims are how it spreads.

What makes forwarded misinformation so durable

The chain email turned out to be an almost perfect vehicle for false etymology, for reasons worth spelling out, because the same features now power viral social-media posts, short videos and AI-generated “fun facts”.

First, the format confers false authority. A numbered list with a confident title looks like reference material, and readers extend to it the trust they would extend to a reference book, even though nothing about an email earns that trust. Second, it is built to be shared. Each phrase is a self-contained surprise, exactly the unit that travels well, and every forward adds a layer of apparent corroboration: by the third time you have seen it, it feels established. Third, the stories are vivid and concrete, and concreteness is mistaken for evidence. “The water was black by the baby’s turn” paints a picture, and a picture is easier to believe and to remember than “this is a German proverb from 1512.”

Fourth, and most corrosively, the compilation format launders individual claims. When fifty etymologies arrive together, no reader checks fifty things; the sheer bulk discourages scrutiny, and the few that sound roughly plausible vouch for the many that do not. A single dubious claim might invite a raised eyebrow. Fifty dubious claims, packaged as a list, invite a forward.

From inbox to “everybody knows”

The truly instructive part is what happened next. Claims from the “1500s” email did not stay in email. They migrated. They turned up in after-dinner speeches, in tour guides’ patter, in classroom asides, in newspaper filler and eventually in the confident captions of social-media posts. Stripped of their absurd original framing, individual claims began to circulate as free-standing facts, and once a claim is loose in the culture it no longer needs its source. People repeat the bathwater story today with no idea that they are quoting a joke email from 1999; they believe they are passing on general knowledge.

This is the mechanism by which a piece of viral content becomes folk etymology in the strict sense: a popular, sincerely believed account of a word’s origin that has nothing to do with its real history. The internet did not invent folk etymology — people have always improvised plausible stories for puzzling phrases — but it industrialised the distribution. What once spread at the speed of conversation now spreads at the speed of a share button, and the compilation format ensures it spreads in bulk.

The medium keeps evolving while the mechanism stays the same. The forwarded email of the late 1990s gave way to the image macro and the listicle, and those in turn to the short vertical video and, most recently, to text generated by machines. Each new format has the same features that made the original so effective: it looks authoritative, it is built to be shared, it favours the vivid over the verifiable, and it bundles claims so that no single one is examined. A confident sixty-second video reciting the bathwater story, or an AI-written “fun facts” paragraph repeating it, is the 1999 email wearing new clothes. The tell is not the platform but the shape of the claim.

How to read an origin claim now

The defence is not cynicism but a couple of habits. Be wary of the list: when many origin “facts” arrive together in a tidy package, treat the packaging itself as a warning, because bulk is how weak claims avoid scrutiny. Be wary of the vivid literal backstory, especially the squalid or macabre kind, because a striking image is precisely what a false etymology uses to displace a dull true one. And notice when a phrase turns out to be a proverb or a translation, as the bathwater phrase is, because deliberate figures of speech rarely need the grubby domestic origins later invented for them.

Above all, ask where the claim actually comes from. For a startling number of today’s word-origin “facts”, the honest answer is not a dictionary, an archive or a scholar, but a forwarded email that has been quietly shedding its punchline for a quarter of a century. Knowing that a claim’s real source is a 1999 chain letter rather than a Tudor bathhouse is, itself, the beginning of getting the history right.