I did. He said "Disprove this statement." I did. Human psychological impulses also prove that you exist in the fact that a chemical reaction has to take place in a set environment for you to create a false entity. The false entity therefore he doesn't truly exist, therefore proving that he does exist. If I had created him in my own mind due to some psychologicaly failed impulse, then he is in fact part of my own conscious being and therefore "exists" in my existence. Now..since that wasn't the original question, the disproof for his existence lies in the fact that the environment recognizes that he exists. Others would recognize my psychological failings (hopefully) and then I would be analyzed and others would recognize the "existence" of him inside of me, therefore making a larger environment recognize him as an institution and co-exister with me.