I need something to cheer me up. Hmm.
It can cause excessive sweating and vomiting.
Is a major component in acide rain.
Can cause severe burns in it's gaseous state
Accidental inhalation can kill you.
contributes to erosion.
decreases effectiveness in automobile breaks.
It has been found in tumours of terminally ill patients.
But in addition to that, both Hitler AND Stalin were known users of Didhydrogen Monoxide. Think twice before using this.