Piff Perkins
Veteran
The Thing, BY FAR.
Unless you take it out by fire (and that's if you even burn it whole and another part of it isn't anywhere else), once it gets out into a populated area or goes into the ocean, it's a total wrap for the entire planet, human or alien.
I never considered it getting into water...

That's scary. It could theoretically take over all aquatic life and really fukk us.