Megalomania is when a person has an excessive desire for power, importance, and grandeur. They tend to believe they are superior and have an exaggerated sense of their abilities and achievements. Full definition
Yanny, now you are showing signs of megalomania by declaring that you were around 5000 years ago! (religion.blogs.cnn.com)
The answer has to be No, if certain conditions all came together again: (1) an economic and political situation as desperate as it was in Hitler's Germany; (2) the rise of a new evil genius with Hitler's demagogic powers; (3) virulent and all - pervading anti-Semitism; (4) repeated use of the «Big Lie» with mastery; and (5) an entire nation's being stricken by megalomania and arrogance, by the curse of pseudoscience, and by the deadly combination of sentimentality and cruelty. (religion-online.org)
She teaches us so much — like how to lob softball questions at clearly insane celebrity guests, and how to turn insufferable megalomania into a billion - dollar empire. (canadianbusiness.com)