Bet you can't. You can't prove that you're really you.
EDIT:
Stop using the argument "I think, therefore I am." argument. It does not present facts.
EDIT 2:
1000 posts and still no proof. C'mon Flood!
EDIT 3:
Stop asking me to prove [i]my[/i] existence. That's not the point of this thread.
EDIT 4:
I know that there are actual theories and beliefs that we are all(or, more correctly, one or a handful of us) just an intelligence and everything else is a projection in a dream state. This argument that I have used in no way represents my views or beliefs.
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I have consciousness. Therefore, I exist. Anyone else, I can't prove. But the fact is that if I have the sentience which I do, it is impossible for me to not exist. Yes, if I happen to [i]be[/i] a computer program (matrix style being [i]in[/i] a computer program is different), I still exist. In some state, I exist, because I have consciousness. That is the fact. I can decide to comment on this pointless thread, and that means that I exist. However, assuming we live in the world we believe we live in, one where everyone exists, I cannot prove to you that I exist. You cannot prove to me that [i]you[/i] exist. But, whether you be a bored teenager or a figment of my imagination, trust me, I exist.