Well theoraticaly ever thing exists if they're parellel worlds. Every time you make a choice the opposite happens creating another parellel world. You average about 35,000 choices a day. This means if your brain decided to fabricate me as merely a dream then in a parallel world your brain made a physical copy of me you could interact with.
[spoiler]Damn this harder than expected[/spoiler]
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But that's all operating under the assumption there [i]is[/i] a parallel world or universe. But there is no proof of such a thing.
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Fair enough. I accept deffeat.