Warning
The information you are about to receive will change your life forever.
[spoiler]Maybe not.
[/spoiler]
A substance commonly called water has been tested to appear in dying/sick humans.
It has also been tested to show that 100% of test subjects that drank it have DIED! It has been also tested in 100% of human beings.
It is simple
If you drink "water",
You will die.
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The joke is better when you say Dihydrogen Monoxide instead of water