Who lives forever, anyway?
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If I were to live forever, complete with invulnerability, I'd probably end up going mad after the eventual demise of the human race. What I'd do is: I'd somehow shoot myself into space, then go into a deep sleep as I drifted, frozen, through the universe. Upon landing on a populated planet somewhere in the far reaches of space, I'd appoint myself deity numero uno and establish a new world order.
Either that, or I'd set out to destroy all life in the universe.