Mr. harlan incorrectly believes that people are constantly laughing at him and that fbi agents are trying to steal his savings. mr. harlan is suffering from

Mr. Harlan is suffering from "delusion".

A delusion is a mixed up conviction that is held with solid conviction notwithstanding when given better proof than the opposite. As a pathology, it is particular from a conviction in view of false or fragmented data, confabulation, creed, deception, or some other misdirecting impacts of discernment. 

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