Water that has been left sitting around the house in a glass for an extended period of time (hours, days, weeks) in the same manner that the girl in Shyamalans movie "Signs" did. This also renders the water questionable as a source of hydration but makes it the perfect weapon against hydrophobic extraterrestrials.
I'm pretty sure I'm going to die without a drink but I refuse to drink the Signs Water on the windowsill from yesterday.
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