Di-Hydrogen Monoxide
Like for example, this story here about the poor folks in Aliso Viejo, California (I've never heard of such a place) who were set to ban di-hydrogen monoxide from their fair city. H2O, sometimes known as water, is used in the manufacturing of many products so this would not have been an easy thing to do.
I don't make these stories up folks, I just report them. Well, okay, on April 1st I have been known to make up a few but only on the 1st. Really.
Aloha!