There's also this option: maybe we're just a product of some green alien's imagination (i.e., a green mutant is sitting in a trans-obliteration class, picking his nose and coming up with all sorts of nonsense about humans, and we're just a consequence of his thoughts)). When the class ends, we'll die)). Apparently, the bell will ring soon - December 21, 2012, is not far off)).
But then, how do we become aware of ourselves? We have consciousness, thoughts, but if a little green man invented us, then there wouldn't be
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Why aren't you writing in the guessing game?