April Fools*!!
Dihydrogen monoxide is another name for water - dihydrogen means 2 hydrogen atoms and monoxide means 1 oxygen atom - H2O!
Share the information from the Coalition to Ban Dihydrogen Monoxide with your students and see if you can get them going - some of them will jump right on board! (You probably work with some people who would join the crusade as well)
It's another lesson in making sure you think and evaluate as you read and listen - everything stated in the "article" is true, but I don't think anyone really wants to ban water.
I've also used this activity with students learning about the rules of compound nomenclature and it has the same effect, whether it's April Fool's Day or not.
*Yes, I know April Fool's Day isn't until tomorrow, but if I waited until tomorrow to share this gem, you would have to wait a whole year before sharing with your students and that just didn't seem right.