In the psychiatry, I review what I jogged down as an intern and found something about delusion and I thought it was kind of fun. Spend a little time to it if you are interested.
Delusion is quite an interesting diagnosis. Some people keep thinking that they are loved by others of higher status. They have the erotomanic type. Another type is called the grandiose type. Some entertainers think they are the most beautiful girls in the world. They have the most handsome, tender, and considerate boy friends in the world. Some think they have an intimate relationship with a mayor. I believe you know a lot of examples about this type of delusion. Jerusalem Syndrome was categorized in the grandiose type by some people too. And the most infamous example is Michael Rohan burned down a Mosque after he visted Jarusalem.