Ah, yes. The dreaded dihydrogen oxide. Colorless, odorless, tasteless, one of the most powerful solvents known to man, and immediately fatal to humans and animals in the right quantity. It causes or facilitates corrosion in all metals when present, and can cause the failure of electronics in minute quantities. It's managed to permeate virtually every living organism and substance on earth due to our careless and profligate use of it.
We need to ban this stuff, and I mean NOW!!
Simply inhaling it will cause death in under 2 minutes.