My main one many years ago was that this new office building in my neighborhood (which I called "The Building") was the headquarters of these secret agency of magic users. They had chosen my neighborhood because of all of the good, positive energy in the land which was caused by my grandfather. (The neighborhood was at one time his farm which he then cut up into subdivisions and had built most of the houses.) Anyway, they were especially focused on the park and built The Building right next to the it.

I was chosen (as heiress,) to be protector of the land since my grandfather was passed away and so was my mom. She was the eldest daughter and I'm her only child, also we still lived on the land and her siblings and my cousins did not. Anyway this secret angecy knew about me, knew that I knew their secret plot, and were after me. And I was trying to come up with a way to stop them....

Unfortunately I had a group of friends who played along with my delusion and did things to really set in stone that it was all true. At some point after moving out of state, it just stopped and went away, but I can't really say when. I didn't remember any of it for about a year to two years when I moved back and drove passed the building one day... The whole thing started when I was 18/19 and stopped when I was about 25/26 when it stopped and 28 when I remembered... I'm 34 now.