Dihydrogen Monoxide is bad juju.
Absolutely, it mixes with oxygen to rust things, thousands of people drown in it, many people are scalded by it and scarred for life or even die, it rots the convertible top of your electric car, bacteria grows in it, man eating sharks thrive in it, it floods the East Coast this weekend, it nearly killed Southern Louisiana last month (congress voted $500,000,000 to repair the damage it did}, man that stuff is really really bad.