In my freshman year of high school, I met a guy named Aaron who was clearly delusional. He claimed to be the CEO of a major internet provider. He told me that he knew everything. To test him, I asked him what Hyperlexia was. He it was similar to Hypertension - oops.
He told me that he uses twenty percent of his brain, unlike the usual ten (perhaps he uses twenty percent as opposed to the usual hundred - the “ten percent” thing is a total myth). He told me that he solved NASA’s hydroponics problem when he was in elementary school.
There was no indication throughout any of this that he didn’t mean to be taken seriously. I do not know whether or not he believed it or if he was intentionally trying to deceive me, but he said it all with a straight face. It was not some subtle form of humor. He wasn’t being a jokester or anything like that.
What kind of personality disorder could he have?