“In the dihydrogen monoxide hoax, water is called by an unfamiliar name, “dihydrogen monoxide”, followed by a listing of real negative effects of this chemical, in a mock attempt to convince people that it should be carefully regulated, labeled as hazardous, or banned. The hoax is designed to illustrate how the lack of scientific literacy and an exaggerated analysis can lead to misplaced fears.[1] “Dihydrogen monoxide”, shortened to “DHMO”, is a name for water that is consistent with basic rules of chemical nomenclature,[2] but is not among the names published by IUPAC[3] and is almost never used.”

Via Wikipedia

And related to the same hoax:

“A student at Eagle Rock Junior High won first prize at the Greater Idaho Falls Science Fair, April 26. He was attempting to show how conditioned we have become to alarmists practicing junk science and spreading fear of everything in our environment. In his project he urged people to sign a petition demanding strict control or total elimination of the chemical “dihydrogen monoxide.”

And for plenty of good reasons, since:

it can cause excessive sweating and vomiting
it is a major component in acid rain
it can cause severe burns in its gaseous state
accidental inhalation can kill you
it contributes to erosion
it decreases effectiveness of automobile brakes
it has been found in tumors of terminal cancer patients
He asked 50 people if they supported a ban of the chemical.

Forty-three (43) said yes,
six (6) were undecided,
and only one (1) knew that the chemical was water.
The title of his prize winning project was, “How Gullible Are We?”

He feels the conclusion is obvious.”

Via the newsgroup: rec.humor.funny