But seriously, Donald Simanek, who authored the website that the above image originates, is actually pointing out the ridiculousness of pseudoscience and surrounding some of the hoaxes out there, even backed with scientific evidence.
According to Snopes.com, the beginnings of the Dihydrogen Monoxide hoax started when two Florida DJs did a prank for April Fools Day, 2013. City officials all the way in California were concerned. Word spread, people panicked, and the DJs were in trouble.
Dihydrogen Monoxide is H20 – water.