Water by another name
The dihydrogen monoxide parody works by taking something almost universally familiar, ordinary water, and describing it using its formal chemical name and a list of properties that are individually accurate but presented in a way designed to sound alarming. Framed correctly, water can be described as a substance involved in corrosion, capable of causing severe burns in its gaseous form, a major component of acid rain, and present in the tissue of virtually every cancer found in humans, all statements that are technically true of water but that, stripped of the word water itself, sound like a case for regulation or outright banning. The joke depends entirely on the audience not recognising dihydrogen monoxide as simply H2O, the compound they already drink, bathe in, and rely on daily without a second thought.
True facts, alarming framing
The format has a documented history rather than being a spontaneous piece of internet humour. An early version appeared as an April Fools’ article in a Michigan newspaper in 1983, describing dihydrogen oxide contaminating water pipes, and the fuller version now widely circulated took shape among housemates at UC Santa Cruz around 1990, later refined into the form still used today by Craig Jackson in 1994. It reached a much broader audience in 1997, when fourteen-year-old Nathan Zohner used the parody as the basis for a science fair project titled How Gullible Are We, surveying 50 fellow students and collecting 43 votes in favour of banning dihydrogen monoxide, a result striking enough that it moved well beyond the science fair itself into wider public discussion.
A newspaper joke that became a template
Zohner’s specific result held up as a genuinely useful demonstration, and it prompted journalist James K. Glassman to coin the term Zohnerism, describing the general technique of using a set of individually true facts to lead an audience lacking relevant scientific background toward a false or exaggerated conclusion. The parody’s staying power as a teaching tool rests on that same mechanism being repeatable and reliable: it is not a one-off trick that worked once on unusually credulous students, but a consistent demonstration of how unfamiliar terminology combined with selectively alarming framing can override an audience’s existing, correct knowledge, since the same people who use water every day without concern will readily vote to restrict dihydrogen monoxide once it is relabelled.
A fourteen-year-old’s science fair result
What the parody does not do is reveal anything new about water itself, since every fact deployed in it is already well established chemistry, nor does it prove that the people fooled by it are unusually foolish, given how often adults in positions of real authority have fallen for the same framing. That last point matters for taking the hoax seriously as more than a joke: a New Zealand Green Party staffer expressed support in 2001 for banning what was described to them as a toxic substance, an Atlanta radio host claimed in 2002 that the local water system was contaminated with it, and in 2004 the city council of Aliso Viejo, California came close to voting on a ban of foam containers over dihydrogen monoxide concerns before the substance was recognised as water.
A word for the trick itself
The wider significance of the parody lies in what it demonstrates about scientific literacy and, more specifically, about how information overload and unfamiliar terminology can substitute for actual understanding in public decision-making, even among officials whose job involves evaluating exactly this kind of claim. It has been used repeatedly since as a teaching example in science education, media literacy, and critical thinking courses, precisely because it produces a clean, testable, and repeatable demonstration of a general vulnerability, jargon combined with alarming framing overriding prior correct knowledge, rather than a single memorable but isolated incident. Penn & Teller also featured the parody in one of their programmes, gathering petition signatures from people describing themselves as concerned environmentalists, further reinforcing how consistently the format succeeds across different audiences.
When it worked on real officials
This is worth a read for the sheer clean simplicity of its lesson: the facts used are never false, only selectively framed, and that distinction is exactly the vulnerability worth understanding in an era of information overload well beyond chemistry classrooms. The documented cases of real officials being fooled give the joke a seriousness that a purely hypothetical description would lack, since it shows the effect is not confined to inexperienced students. Anyone interested in media literacy, science communication, or simply enjoying a well-documented practical joke with genuine educational teeth will find this a satisfying and quick use of time.